A012211 - OEIS

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A012211

sech(arctan(atan(x)))=1-1/2!*x^2+21/4!*x^4-1149/6!*x^6+119305/8!*x^8...

1, -1, 21, -1149, 119305, -20082841, 4984310493, -1711500674389, 776816116717457, -450301381427975089, 324553968807761095973, -284661632752853556677805, 298518404617173649259722905 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A012230 A086098 A086875 * A036059 A036519 A118446` `Adjacent sequences: A012208 A012209 A012210 * A012212 A012213 A012214`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 18 00:14 EST 2012. Contains 206085 sequences.