A032174 Number of series-reduced planted compound windmills with n leaves of 2 colors with no symmetries.

2, 1, 4, 15, 66, 291, 1368, 6555, 32262, 161505, 821280, 4227710, 21996052, 115469442, 610894004, 3253836785, 17434360442, 93907348819, 508194420136, 2761768079091, 15065823780102, 82469439357341

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 "CHK" (necklace, identity, unlabeled) transform.

Prog

(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

Crossrefs

Sequence in context: A350739 A263575 A162977 * A212267 A344110 A346793

Adjacent sequences: A032171 A032172 A032173 * A032175 A032176 A032177

Keyword

nonn

Author

Christian G. Bower

Status

approved