Voozh

A009361

Expansion of e.g.f.: log(1+sinh(x)/cos(x)).

0, 1, -1, 6, -22, 140, -976, 8456, -83952, 957840, -12249856, 174293856, -2725714432, 46514037440, -859767771136, 17115342333056, -365039421683712, 8304761365213440, -200743169243938816, 5137820023434733056, -138802582805546401792, 3947233200665413667840

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OFFSET

0,4

LINKS

Table of n, a(n) for n=0..21.

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Log[1+Sinh[x]/Cos[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Apr 19 2018 *)

CROSSREFS

Sequence in context: A009358 A213130 A002137 * A193445 A075759 A000993

Adjacent sequences: A009358 A009359 A009360 * A009362 A009363 A009364

KEYWORD

sign,easy