A032058 - OEIS

A032058

"BGK" (reversible, element, unlabeled) transform of 1,1,1,1,...

1, 1, 1, 2, 2, 3, 6, 7, 10, 14, 29, 33, 51, 67, 97, 176, 218, 309, 426, 589, 778, 1376, 1649, 2379, 3147, 4381, 5653, 7802, 12158, 15231, 20934, 27871, 37438, 49022, 65405, 84213, 128703, 157987, 215533, 279164, 375746, 479133

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

LINKS

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

C. G. Bower, Transforms (2)

FORMULA

Numbers so far satisfy a(n) = 1/2 * (A032020(n)+1). - Ralf Stephan, Apr 06 2004

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)))] \\ Andrew Howroyd, Sep 13 2018

CROSSREFS

Sequence in context: A229626 A358088 A091770 * A241744 A308514 A039866

Adjacent sequences: A032055 A032056 A032057 * A032059 A032060 A032061

KEYWORD

nonn

AUTHOR

Christian G. Bower

EXTENSIONS

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

STATUS

approved