Search: id:a032174
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A032174
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Number of series-reduced planted compound windmills with n leaves of 2 colors with no symmetries.
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6
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2, 1, 4, 15, 66, 291, 1368, 6555, 32262, 161505, 821280, 4227710, 21996052, 115469442, 610894004, 3253836785, 17434360442, 93907348819, 508194420136, 2761768079091, 15065823780102, 82469439357341
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OFFSET
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1,1
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LINKS
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FORMULA
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Doubles (index 2+) under "CHK" (necklace, identity, unlabeled) transform.
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PROG
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(PARI)
CHK(p, n)={sum(d=1, n, moebius(d)/d*log(subst(1/(1+O(x*x^(n\d))-p), x, x^d)))}
seq(n)={my(p=2*x); for(i=2, n, p+=x^i*polcoeff(CHK(p, i), i)); Vecrev(p/x)} \\ Andrew Howroyd, Jun 21 2018
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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