A012971 - OEIS

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A012971

sech(arctan(x)+log(x+1))=1-4/2!*x^2+6/3!*x^3+77/4!*x^4-340/5!*x^5...

1, 0, -4, 6, 77, -340, -3670, 34230, 303425, -5406840, -35315200, 1225800950, 4445446925, -374586782700, 9072379550, 147143429091750, -687446930233375, -71491380123358000, 767045215539726500 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A012898 A013080 A013128 * A197315 A061216 A058163` `Adjacent sequences: A012968 A012969 A012970 * A012972 A012973 A012974`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 14 06:40 EST 2012. Contains 205573 sequences.