A012098 - OEIS

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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...

1, -1, 9, -249, 13297, -1175761, 154625721, -28328562313, 6890453792609, -2147692998841633, 834418870682339561, -395288520944694504345, 224249503561141591847505, -150078278389547160573482225 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A183235 A161159 A012202 * A012072 A007408 A066989` `Adjacent sequences: A012095 A012096 A012097 * A012099 A012100 A012101`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 16 01:31 EST 2012. Contains 205860 sequences.