A032139 "CFK" (necklace, size, unlabeled) transform of 2,2,2,2...

1, 2, 2, 6, 6, 10, 26, 30, 46, 66, 178, 198, 326, 442, 666, 1566, 1886, 2882, 4082, 5942, 8006, 18426, 21450, 33502, 45854, 67314, 89074, 128310, 252406, 309498, 459914, 635470, 904350, 1214514, 1702562, 2240246, 4261430

Offset

0,2

Links

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

C. G. Bower, Transforms (2)

Index entries for sequences related to Lyndon words

Prog

(PARI) seq(n)={apply(p->subst(serlaplace(p/y), y, 1), Vec(y-1+prod(k=1, n, 1 + 2*x^k*y + O(x*x^n))))} \\ Andrew Howroyd, Jun 21 2018

Crossrefs

Sequence in context: A290261 A007040 A351017 * A032043 A200561 A241380

Adjacent sequences: A032136 A032137 A032138 * A032140 A032141 A032142

Keyword

nonn

Author

Christian G. Bower

Extensions

a(0)=1 prepended by Andrew Howroyd, Jun 21 2018

Status

approved