A032174 - OEIS

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

(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 "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