A032218 - OEIS

A032218

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

1, 1, 1, 2, 3, 6, 12, 25, 51, 111, 244, 543, 1219, 2783, 6352, 14763, 34208, 80271, 188517, 446696, 1057534, 2527328, 6029096, 14488609, 34792504, 84059268, 202861050, 492369844, 1193743829, 2907834039, 7078295983, 17300759883, 42248522887, 103574837980

(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 "DFK" (bracelet, size, unlabeled) transform.

PROG

(PARI)

DFK(v)={apply(p->subst(serlaplace(p/y + polcoeff(p, 1) + polcoeff(p, 2)), y, 1)/2, 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], DFK(v))); v} \\ Andrew Howroyd, Sep 20 2018