A012840 - OEIS

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A012840

exp(sec(x)*arctanh(x))=1+x+1/2!*x^2+6/3!*x^3+21/4!*x^4+120/5!*x^5...

1, 1, 1, 6, 21, 120, 765, 5376, 46473, 415104, 4371225, 48143744, 594635613, 7784817664, 110691178325, 1673986906112, 27018807872657, 462531126525952, 8370279766396593, 159859054841331712 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	CROSSREFS	`Sequence in context: A060843 A026650 A009253 * A013320 A056308 A081077` `Adjacent sequences: A012837 A012838 A012839 * A012841 A012842 A012843`
	KEYWORD	`nonn`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 13 08:12 EST 2012. Contains 205451 sequences.