A012839 - OEIS

This site is supported by donations to The OEIS Foundation.

A012839

sech(sec(x)*tanh(x))=1-1/2!*x^2+1/4!*x^4-97/6!*x^6+2945/8!*x^8...

1, -1, 1, -97, 2945, -148929, 15801729, -1624918817, 267458400513, -52723991194497, 12773658359030017, -3865567565691658721, 1370070916604727994497, -576252092267236760553793 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	CROSSREFS	`Sequence in context: A162542 A020538 A075665 * A017813 A017760 A069419` `Adjacent sequences: A012836 A012837 A012838 * A012840 A012841 A012842`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

Content is available under The OEIS End-User License Agreement .

Last modified February 13 11:38 EST 2012. Contains 205467 sequences.