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A032143 Number of compound rooted windmills with n nodes where any 2 submills extending from the same node are of different sizes. 1
1, 1, 1, 2, 3, 6, 13, 28, 60, 135, 316, 731, 1735, 4133, 9937, 24133, 58820, 144227, 355966, 881868, 2192529, 5479166, 13717843, 34474835, 86848986, 219454215, 555371300, 1409893698, 3583579216, 9130512970, 23294809707 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

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

Index entries for sequences related to mobiles

FORMULA

Shifts left under "CFK" (necklace, size, unlabeled) transform

PROG

(PARI)

CFK(v)={apply(p->subst(serlaplace(p/y), y, 1), Vec(-1+prod(k=1, #v, 1 + v[k]*x^k*y + O(x*x^#v)), -#v))}

seq(n)={my(v=[1]); for(i=2, n, v=concat([1], CFK(v))); v} \\ Andrew Howroyd, Sep 20 2018

CROSSREFS

Sequence in context: A274493 A075853 A132045 * A032160 A089735 A316694

Adjacent sequences:  A032140 A032141 A032142 * A032144 A032145 A032146

KEYWORD

nonn

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified October 15 20:17 EDT 2018. Contains 316237 sequences. (Running on oeis4.)