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A009124 Expansion of cosh(ln(1+sinh(x))). 0
1, 0, 1, -3, 16, -90, 616, -4893, 44416, -453540, 5145856, -64222983, 874402816, -12897183390, 204862698496, -3486535686273, 63292764553216, -1220795601029640, 24931903045697536, -537463528325234763 (list; graph; refs; listen; history; internal format)
OFFSET

0,4

FORMULA

a(2n) = A006154(2n)/2, n>0. - R. Stephan, Apr 29 2004

MATHEMATICA

Cosh[ Log[ 1+Sinh[ x ] ] ]

CROSSREFS

Sequence in context: A146963 A074562 A130744 * A067679 A099952 A074555

Adjacent sequences:  A009121 A009122 A009123 * A009125 A009126 A009127

KEYWORD

sign,easy

AUTHOR

R. H. Hardin (rhhardin(AT)att.net)

EXTENSIONS

Extended with signs Mar 15 1997 by Olivier Gerard.

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Last modified February 16 21:42 EST 2012. Contains 205977 sequences.