Voozh

A013206

E.g.f.: log(sech(x)+sinh(x))=x-2/2!*x^2+6/3!*x^3-20/4!*x^4+120/5!*x^5...

0, 1, -2, 6, -20, 120, -872, 7056, -68000, 758400, -9460352, 130918656, -1995073280, 33173038080, -597457144832, 11587651270656, -240799724687360, 5337660866396160, -125711013390221312

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

OFFSET

0,3

LINKS

Table of n, a(n) for n=0..18.

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Log[Sech[x]+Sinh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 16 2014 *)

CROSSREFS

Sequence in context: A366760 A136795 A074115 * A073966 A013203 A007847

Adjacent sequences: A013203 A013204 A013205 * A013207 A013208 A013209

KEYWORD

sign

AUTHOR

Patrick Demichel

EXTENSIONS

Definition clarified and zero prepended by Harvey P. Dale, May 16 2014

STATUS

approved

URL: https://oeis.org/A013206

⇱ A013206 - OEIS