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Search: id:A012086
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A012086 sech(arcsin(tan(x)))=1-1/2!*x^2-7/4!*x^4-121/6!*x^6-5167/8!*x^8... +0
1
1, -1, -7, -121, -5167, -487441, -78804727, -18558463561, -5919443326687, -2457116797560481, -1289150916753299047, -834798631079038210201, -654139310316332313889807, -610085118687493622960844721 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A094088 A012043 A012103 this_sequence A074487 A113162 A084940

Adjacent sequences: A012083 A012084 A012085 this_sequence A012087 A012088 A012089

KEYWORD

sign

AUTHOR

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

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Last modified September 7 15:23 EDT 2008. Contains 143483 sequences.

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