A012813 - OEIS

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A012813

sech(sec(x)*arctan(x))=1-1/2!*x^2+1/4!*x^4-145/6!*x^6+6977/8!*x^8...

1, -1, 1, -145, 6977, -568865, 80708417, -14347965489, 3496685652353, -1086579978065473, 419435785375158145, -197705949756543164369, 111488102700546889037505, -74151248251988209281143905 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	CROSSREFS	`Sequence in context: A008377 A076464 A192842 * A018232 A097730 A060720` `Adjacent sequences: A012810 A012811 A012812 * A012814 A012815 A012816`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 16 06:18 EST 2012. Contains 205860 sequences.