A068917 - OEIS

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A068917

Numerators of coefficients in 1/sin(x)-1/sinh(x) power series.

1, 31, 73, 8191, 5749691557, 3324754717, 22076500342261, 925118910976041358111, 8089941578146657681, 21194489326041221593005331, 3342730069684120811652882591487741, 4204720064739945338027515648494601 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`a(3k+1)=(4k+2)! a(3k+2)=(4k+4)! a(3k+3)=(4k+5)!/2`
	EXAMPLE	`cosec(x) -cosech(x) = x/3 +31x^5/7560 +73x^9/1710720 +8191*x^13/18681062400 +...`
	CROSSREFS	`Cf. A068918.` `Sequence in context: A155933 A163428 A130468 * A009408 A165615 A142408` `Adjacent sequences: A068914 A068915 A068916 * A068918 A068919 A068920`
	KEYWORD	`easy,frac,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 29 2002`

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Last modified February 16 10:07 EST 2012. Contains 205904 sequences.