A032163 Number of series-reduced planted compound windmills with n leaves of 2 colors where any 2 submills extending from the same node are different.

2, 1, 2, 6, 18, 63, 232, 868, 3338, 13105, 52270, 210822, 859528, 3535424, 14654628, 61150659, 256674992, 1083008336, 4590945532, 19542842196, 83504907276, 358032884540, 1539885406796, 6641914100221

Offset

1,1

Links

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

C. G. Bower, Transforms (2)

Index entries for sequences related to mobiles

Formula

Doubles (index 2+) under "CGK" (necklace, element, unlabeled) transform.

Prog

(PARI)
CGK(v)={apply(p->subst(serlaplace(p/y), y, 1), Vec(prod(k=1, #v, (1 + x^k*y + O(x*x^#v))^v[k])-1, -#v))}
seq(n)={my(v=[2]); for(i=2, n, v=concat(v, CGK(concat(v, [0]))[i])); v} \\ Andrew Howroyd, Sep 20 2018

Crossrefs

Sequence in context: A246466 A170829 A032085 * A038078 A000139 A302190

Adjacent sequences: A032160 A032161 A032162 * A032164 A032165 A032166

Keyword

nonn

Author

Christian G. Bower

Status

approved