A032289 - OEIS

A032289

Number of dyslexic rooted compound windmills with n nodes.

1, 1, 2, 4, 9, 20, 49, 119, 305, 790, 2100, 5648, 15449, 42664, 119128, 335310, 951119, 2714974, 7795211, 22493655, 65202995, 189767806, 554326057, 1624572250, 4775504516, 14076385819, 41596613660, 123206155126

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OFFSET

1,3

LINKS

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

Index entries for sequences related to mobiles

FORMULA

Shifts left 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=O(1)); for(i=1, n, p=1+DIK(x*p, i)); Vec(p)} \\ Andrew Howroyd, Jun 20 2018

CROSSREFS

Cf. A038038.

Sequence in context: A289971 A093637 A068051 * A006648 A128496 A134955

Adjacent sequences: A032286 A032287 A032288 * A032290 A032291 A032292

KEYWORD

nonn,eigen

AUTHOR

Christian G. Bower

STATUS

approved