A024272 E.g.f. tan(x)*sinh(x)/2 (even powers only).

0, 1, 6, 71, 1596, 58141, 3109986, 229395011, 22312837176, 2767173538681, 426167405495166, 79796244279937151, 17851790220732115956, 4702787739658825158421, 1440911869083478804851546, 508062238427253843822090491, 204262590490127231070131373936, 92884219961086104169154295141361

Offset: 0

Author

R. H. Hardin

Keywords

• nonn

Links

• G. C. Greubel, Table of n, a(n) for n = 0..240

Crossrefs

A009747.

Programs

Mathematica

With[{nn = 50}, Take[CoefficientList[Series[Tan[x]*Sinh[x]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* G. C. Greubel, Apr 12 2017 *)

PARI

x='x+O('x^66); v=Vec(serlaplace(tan(x)*sinh(x)/2)); concat([0],vector(#v\2,n,v[2*n-1])) \\ Joerg Arndt, Apr 26 2013

Extensions

Extended and signs tested 03/97.