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A009731 Expansion of tan(x)*cosh(ln(1+x)). 0
0, 1, 0, 5, -12, 96, -480, 3968, -29568, 283840, -2759040, 31139712, -369431040, 4852567552, -67622790144, 1018594276352, -16267048304640, 277008597516288, -4982377179119616, 94730142262034432, -1894021067538432000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

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

MATHEMATICA

Tan[ x ]*Cosh[ Log[ 1+x ] ]

CROSSREFS

Sequence in context: A064371 A009414 A009426 * A009427 A009754 A096314

Adjacent sequences:  A009728 A009729 A009730 * A009732 A009733 A009734

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 August 23 03:34 EDT 2014. Contains 245976 sequences.