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A009178
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Expansion of cosh(x)*cosh(ln(1+x)).
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0
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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; internal format)
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OFFSET
| 0,3
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MATHEMATICA
| With[{nn=20}, CoefficientList[Series[Cosh[x]Cosh[Log[1+x]], {x, 0, nn}], x]Range[0, nn]!] (* From Harvey P. Dale, Feb 02 2012 *)
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CROSSREFS
| Sequence in context: A153409 A143893 A072263 * A141508 A119344 A072877
Adjacent sequences: A009175 A009176 A009177 * A009179 A009180 A009181
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KEYWORD
| sign,easy
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net)
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EXTENSIONS
| Extended with signs Mar 15 1997 by Olivier Gerard.
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