A012202 - OEIS

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A012202

sech(arctan(arcsin(x)))=1-1/2!*x^2+9/4!*x^4-249/6!*x^6+11953/8!*x^8...

1, -1, 9, -249, 11953, -992401, 115133433, -19289685193, 4104153335777, -1154213252748193, 390283459641717353, -165544701587974757145, 81456402896849322863505, -48584594120969426596224305 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A112028 A183235 A161159 * A012098 A012072 A007408` `Adjacent sequences: A012199 A012200 A012201 * A012203 A012204 A012205`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.