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Search: id:A012098
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A012098 sech(arcsin(arctan(x)))=1-1/2!*x^2+9/4!*x^4-249/6!*x^6+13297/8!*x^8... +0
1
1, -1, 9, -249, 13297, -1175761, 154625721, -28328562313, 6890453792609, -2147692998841633, 834418870682339561, -395288520944694504345, 224249503561141591847505, -150078278389547160573482225 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A112028 A161159 A012202 this_sequence A012072 A007408 A066989

Adjacent sequences: A012095 A012096 A012097 this_sequence A012099 A012100 A012101

KEYWORD

sign

AUTHOR

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

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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.

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