A032215 "DFK" (bracelet, size, unlabeled) transform of 2,1,1,1...

1, 2, 1, 3, 3, 4, 6, 7, 9, 11, 19, 21, 30, 38, 50, 83, 101, 137, 183, 249, 310, 524, 618, 871, 1125, 1543, 1959, 2621, 3934, 4890, 6582, 8639, 11417, 14765, 19499, 24509, 36486, 44424, 59698, 76235, 101481, 127807, 168747, 212221, 273294

Offset

0,2

Links

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

C. G. Bower, Transforms (2)

Prog

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

Crossrefs

Sequence in context: A130067 A282906 A032303 * A117363 A007307 A207617

Adjacent sequences: A032212 A032213 A032214 * A032216 A032217 A032218

Keyword

nonn

Author

Christian G. Bower

Extensions

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

Status

approved