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A032231 "DGK" (bracelet, element, unlabeled) transform of 2,2,2,2,... 1
1, 2, 3, 6, 9, 14, 24, 40, 64, 120, 197, 348, 609, 1098, 1808, 3078, 5602, 9118, 15789, 25568, 43857, 73632, 120882, 195236, 317706, 532906, 843805, 1387158, 2184539, 3473958, 5532978, 8954424, 13933058, 21956952 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..1000

C. G. Bower, Transforms (2)

PROG

(PARI) seq(n)=[subst(serlaplace(p/y + polcoeff(p, 1) + polcoeff(p, 2)), y, 1)/2 | p <- Vec(y-1+prod(k=1, n, 1 + x^k*y + O(x*x^n))^2)] \\ Andrew Howroyd, Sep 13 2018

CROSSREFS

Sequence in context: A115856 A147007 A146937 * A200273 A303664 A190276

Adjacent sequences:  A032228 A032229 A032230 * A032232 A032233 A032234

KEYWORD

nonn

AUTHOR

Christian G. Bower

EXTENSIONS

a(0)=1 prepended by Andrew Howroyd, Sep 13 2018

STATUS

approved

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Last modified October 17 19:36 EDT 2018. Contains 316293 sequences. (Running on oeis4.)