A012882 - OEIS

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A012882

exp(sech(x)*arctanh(x))=1+x+1/2!*x^2-3/4!*x^4+20/5!*x^5+165/6!*x^6...

1, 1, 1, 0, -3, 20, 165, 784, 1337, 26256, 356745, 4466176, 31874997, 435729216, 5714452653, 104111460608, 1296863374193, 23261262303488, 357091592679441, 7794968497086464, 131690816886952045 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	CROSSREFS	`Sequence in context: A074560 A123355 A192509 * A063017 A145329 A051643` `Adjacent sequences: A012879 A012880 A012881 * A012883 A012884 A012885`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 14 16:32 EST 2012. Contains 205635 sequences.