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#24 by Jon E. Schoenfield at Fri Oct 27 05:59:30 EDT 2023
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#23 by Jon E. Schoenfield at Fri Oct 27 05:59:28 EDT 2023
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| AUTHOR
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_N. J. A. Sloane_._
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approved
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#22 by Susanna Cuyler at Thu Oct 24 10:23:35 EDT 2019
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#21 by Jean-François Alcover at Thu Oct 24 08:58:52 EDT 2019
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#20 by Jean-François Alcover at Thu Oct 24 08:58:48 EDT 2019
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| MATHEMATICA
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m = 30;
A[x_] = (-1 + Exp[Sum[psi[x^k]/k, {k, 1, m}]] /. psi[x_] -> (1 + 2 x - Sqrt[1 - 4 x] Sqrt[1 - 4 x^2])/(4 Sqrt[1 - 4 x^2])) + O[x]^m;
CoefficientList[A[x], x] // Rest (* Jean-François Alcover, Oct 24 2019 *)
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approved
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#19 by Joerg Arndt at Wed Jan 10 03:15:10 EST 2018
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#18 by Michel Marcus at Wed Jan 10 03:10:25 EST 2018
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#17 by Michel Marcus at Wed Jan 10 03:09:58 EST 2018
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| REFERENCES
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Hanlon, Phil; Counting interval graphs. Trans. Amer. Math. Soc. 272 (1982), no. 2, 383-426.
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| LINKS
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Phil Hanlon, <a href="http://dx.doi.org/10.1090/S0002-9947-1982-0662044-8">Counting interval graphs</a>, Trans. Amer. Math. Soc. 272 (1982), no. 2, 383-426.
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approved
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#16 by OEIS Server at Mon Jul 21 18:27:51 EDT 2014
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| LINKS
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R. W. Robinson, <a href="/A005217/b005217_1.txt">Table of n, a(n) for n = 1..190</a>
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#15 by Alois P. Heinz at Mon Jul 21 18:27:51 EDT 2014
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Discussion
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| Mon Jul 21
| 18:27
| OEIS Server: Installed new b-file as b005217.txt. Old b-file is now b005217_1.txt.
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