A277475 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A277475

E.g.f.: -sin(x)*LambertW(-x).

0, 0, 2, 6, 32, 300, 3576, 52234, 906688, 18229176, 416505760, 10657541422, 301871501568, 9375794555556, 316817746172032, 11570642333807730, 454152692297009152, 19064517871187079408, 852278820775206658560, 40424330665968520135382, 2027524052626732381306880

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

OFFSET

0,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..385

FORMULA

a(n) ~ sin(exp(-1)) * n^(n-1).

MATHEMATICA

CoefficientList[Series[-Sin[x]*LambertW[-x], {x, 0, 20}], x] * Range[0, 20]!

Table[Sum[Binomial[n, k] * Sin[Pi*(n-k)/2] * k^(k-1), {k, 1, n}], {n, 0, 20}] (* Vaclav Kotesovec, Oct 28 2016 *)

PROG

(PARI) x='x+O('x^50); concat([0, 0], Vec(serlaplace(-sin(x)*lambertw(-x)) )) \\ G. C. Greubel, Nov 07 2017