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A032288 "DIK" (bracelet, indistinct, unlabeled) transform of 1,3,5,7... 1
1, 4, 9, 22, 46, 109, 237, 571, 1362, 3459, 8881, 23698, 63846, 175489, 485941, 1359240, 3821170, 10803787, 30654681, 87295726, 249262766, 713583861, 2047210813, 5885081941, 16947632202, 48885431563, 141220349049 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

C. G. Bower, Transforms (2)

Index entries for sequences related to bracelets

PROG

(PARI) seq(n)={Vec(x*(1 + 2*x - x^2 + 2*x^3 + 2*x^4 + 2*x^5)/((1 - x)^2*(1 - 3*x^2)) + sum(d=1, n, eulerphi(d)/d*log((1-x^d)^2/(1-3*x^d) + O(x*x^n))))/2} \\ Andrew Howroyd, Jun 20 2018

CROSSREFS

Sequence in context: A200155 A002835 A253289 * A076859 A042833 A048654

Adjacent sequences:  A032285 A032286 A032287 * A032289 A032290 A032291

KEYWORD

nonn

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified October 22 18:55 EDT 2018. Contains 316500 sequences. (Running on oeis4.)