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A009786 Expansion of tanh(log(1+x)/cos(x)). 0
0, 1, -1, 3, 0, -45, 465, -3759, 22232, -70059, -1060245, 28407599, -453971496, 5589320503, -48353999603, 7539772397, 12427981991760, -374837737029719, 7794717166601847, -122407621058565797, 1113301750728210320 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

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

MATHEMATICA

Tanh[ Log[ 1+x ]/Cos[ x ] ]

CROSSREFS

Sequence in context: A164806 A105751 A177698 * A012738 A193410 A271762

Adjacent sequences:  A009783 A009784 A009785 * A009787 A009788 A009789

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved

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Last modified April 25 21:06 EDT 2019. Contains 322461 sequences. (Running on oeis4.)