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A032204 Number of series-reduced planted compound windmills with n leaves of 2 colors. 1
2, 3, 10, 44, 208, 1109, 6118, 35237, 207934, 1253287, 7675826, 47646436, 299041848, 1894604820, 12100426672, 77824808724, 503607919768, 3276529572798, 21420197993784, 140637939255210, 926969395669496 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..200

Index entries for sequences related to mobiles

FORMULA

Doubles (index 2+) under "CIK" (necklace, indistinct, unlabeled) transform.

PROG

(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=2*x); for(i=2, n, p+=x^i*polcoeff(CIK(p, i), i)); Vecrev(p/x)} \\ Andrew Howroyd, Jun 21 2018

CROSSREFS

Sequence in context: A024484 A007226 A243642 * A106643 A020116 A290713

Adjacent sequences:  A032201 A032202 A032203 * A032205 A032206 A032207

KEYWORD

nonn

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified October 22 09:57 EDT 2018. Contains 316433 sequences. (Running on oeis4.)