A032160 Number of rooted compound windmills with n nodes where any 2 submills extending from the same node are different.

1, 1, 1, 2, 3, 6, 13, 28, 61, 138, 325, 758, 1804, 4317, 10457, 25484, 62478, 154000, 381494, 949217, 2370840, 5943552, 14946766, 37700390, 95346724, 241744854, 614328965, 1564488480, 3992092421, 10205366192

Offset

1,4

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

Shifts left 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=[1]); for(i=2, n, v=concat([1], CGK(v))); v} \\ Andrew Howroyd, Sep 20 2018

Crossrefs

Sequence in context: A075853 A132045 A032143 * A089735 A316694 A000646

Adjacent sequences: A032157 A032158 A032159 * A032161 A032162 A032163

Keyword

nonn

Author

Christian G. Bower

Status

approved