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Search: id:A012852
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A012852 sech(sec(x)*arctanh(x))=1-1/2!*x^2-15/4!*x^4-225/6!*x^6+3297/8!*x^8... +0
1
1, -1, -15, -225, 3297, 973695, 99434577, 3364479391, -1767300967487, -640573924497921, -102867079807004495, 22939113754550703391, 27513402069157221548193, 11830594343212717024871295 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A137916 A171320 A078364 this_sequence A171289 A001024 A012643

Adjacent sequences: A012849 A012850 A012851 this_sequence A012853 A012854 A012855

KEYWORD

sign

AUTHOR

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

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Last modified March 18 09:28 EDT 2010. Contains 173524 sequences.

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