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Denominators in the series for sin integral Si(x).

+0
3

1, 18, 600, 35280, 3265920, 439084800, 80951270400, 19615115520000, 6046686277632000, 2311256907767808000, 1072909785605898240000, 594596384994354462720000, 387780251083274649600000000 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Si(x)= integral sin(t)/t dt from 0 to x`
	REFERENCES	`Bronstein-Semendjajew, Taschenbuch der Mathematik, 13th ed. 1974, ch. 4.3.7, integral 283 of 515`
	LINKS	`Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets` `Eric Weisstein's World of Mathematics, Shi`
	FORMULA	`a(n) = (2n-1)*(2n-1)!`
	EXAMPLE	`Si(x)= x/1 -x^3/18 +x^5/600 -x^7/35280 +x^9/3265920 -+...`
	CROSSREFS	`Sequence in context: A035277 A011906 A133401 this_sequence A166767 A003298 A049869` `Adjacent sequences: A061076 A061077 A061078 this_sequence A061080 A061081 A061082`
	KEYWORD	`easy,nonn`
	AUTHOR	`Frank.Ellermann(AT)t-online.de, May 29 2001`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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