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A032203
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Number of series-reduced planted compound windmills with n leaves.
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2
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1, 1, 2, 5, 12, 36, 104, 331, 1062, 3519, 11809, 40327, 139066, 484698, 1702819, 6026452, 21460248, 76846950, 276524978, 999423375, 3626370269, 13205135288, 48241233346, 176757275833, 649399348322, 2391817886703
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OFFSET
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1,3
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LINKS
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FORMULA
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Doubles (index 2+) under "CIK" (necklace, indistinct, unlabeled) transform.
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PROG
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(PARI)
CIK(p, n)={sum(d=1, n, eulerphi(d)/d*log(subst(1/(1+O(x*x^(n\d))-p), x, x^d)))}
seq(n)={my(p=x); for(i=2, n, p+=x^i*polcoeff(CIK(p, i), i)); Vecrev(p/x)} \\ Andrew Howroyd, Jun 21 2018
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CROSSREFS
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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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