A032061 "BGK" (reversible, element, unlabeled) transform of 2,2,2,2,...

1, 2, 3, 6, 13, 22, 53, 104, 189, 420, 739, 1420, 2687, 5198, 8907, 15762, 30709, 51322, 92765, 153932, 275181, 478560, 806515, 1334656, 2222951, 3864914, 6233763, 10538622, 16896061, 27407110, 44632877, 74032352, 117178797

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(y^0*p + polcoeff(p, 1)), 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: A111503 A239326 A075530 * A350435 A155996 A240104

Adjacent sequences: A032058 A032059 A032060 * A032062 A032063 A032064

Keyword

nonn

Author

Christian G. Bower

Extensions

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

Status

approved