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Search: id:A013207
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A013207 log(sech(x)+arcsinh(x))=x-2/2!*x^2+4/3!*x^3-12/4!*x^4+68/5!*x^5... +0
1
1, -2, 4, -12, 68, -440, 3064, -26208, 265936, -2945152, 35730176, -485182720, 7235106240, -115677206528, 1984468240000, -36707903762432, 725871298851072, -15190637885095936, 336136505074527232 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A004400 A005831 A137160 this_sequence A078919 A085864 A060935

Adjacent sequences: A013204 A013205 A013206 this_sequence A013208 A013209 A013210

KEYWORD

sign

AUTHOR

Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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