A032293 - OEIS

A032293

Number of series-reduced dyslexic planted compound windmills with n leaves of 2 colors.

2, 3, 10, 41, 180, 873, 4406, 23226, 125722, 696139, 3920842, 22398781, 129445934, 755446276, 4445631466, 26350577022, 157171541470, 942671178054, 5681706775452, 34395634415206, 209045930188038

(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 "DIK" (bracelet, indistinct, unlabeled) transform.

PROG

(PARI)

DIK(p, n)={(sum(d=1, n, eulerphi(d)/d*log(subst(1/(1+O(x*x^(n\d))-p), x, x^d))) + ((1+p)^2/(1-subst(p, x, x^2))-1)/2)/2}

seq(n)={my(p=2*x); for(i=2, n, p+=x^i*polcoeff(DIK(p, i), i)); Vecrev(p/x)} \\ Andrew Howroyd, Jun 21 2018

CROSSREFS

Sequence in context: A064183 A050381 A129716 * A059733 A037390 A024484

Adjacent sequences: A032290 A032291 A032292 * A032294 A032295 A032296

KEYWORD

nonn

AUTHOR

Christian G. Bower

STATUS

approved