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A003222
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a(n) = 2^(3*n+1) - 2*n*(2*n+1).
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1
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2, 10, 108, 982, 8120, 65426, 524132, 4194094, 33554160, 268435114, 2147483228, 17179868678, 137438952872, 1099511627074, 8796093021396, 70368744176734, 562949953420256, 4503599627369306, 36028797018962636
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = 11*a(n-1) - 27*a(n-2) + 25*a(n-3) - 8*a(n-4).
G.f.: 2*(1 - 6*x + 26*x^2 + 7*x^3)/ ( (8*x-1)* (x-1)^3). (End)
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PROG
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(PARI) a(n) = 2^(3*n+1)-2*n*(2*n+1); \\ Altug Alkan, Sep 21 2018
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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