id:A013302 - OEIS Search Results

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cosh(log(x+1)-arctanh(x))=1+3/4!*x^4+90/6!*x^6+4725/8!*x^8...

+0
3

1, 0, 3, 90, 4725, 396900, 49116375, 8428369950, 1917454163625, 558800927685000, 203054287097536875, 90020733946574681250, 47828015945815128148125, 30001210002374944020187500 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Number of degree-2n permutations without odd cycles and with even number of even cycles. E.g.f.: (2-x^2)/(2*sqrt(1-x^2)). - Vladeta Jovovic (vladeta(AT)Eunet.yu), Aug 10 2007`
	CROSSREFS	`Cf. A013299.` `Adjacent sequences: A013299 A013300 A013301 this_sequence A013303 A013304 A013305` `Sequence in context: A012857 A013304 A013298 this_sequence A013303 A132556 A053996`
	KEYWORD	`nonn`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

AT&T Labs Research