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A009178 Expansion of cosh(x)*cosh(ln(1+x)). 0
1, 0, 2, -3, 19, -90, 556, -3885, 31109, -279972, 2799766, -30797415, 369569047, -4804397598, 67261566464, -1008923496945, 16142775951241, -274427191171080, 4939689441079594, -93854099380512267, 1877081987610245531 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..20.

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Cosh[x]Cosh[Log[1+x]], {x, 0, nn}], x]Range[0, nn]!] (* Harvey P. Dale, Feb 02 2012 *)

CROSSREFS

Sequence in context: A153409 A143893 A072263 * A141508 A119344 A072877

Adjacent sequences:  A009175 A009176 A009177 * A009179 A009180 A009181

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 15 1997 by Olivier Gérard.

STATUS

approved

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Last modified December 21 12:47 EST 2014. Contains 252321 sequences.