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a(n) is the denominator of the coefficient of z^(2n-1) in the Maclaurin expansion of Sqrt[Pi]Erfi[z].

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1, 3, 5, 21, 108, 660, 4680, 37800, 342720, 3447360, 38102400, 459043200, 5987520000, 84064780800, 1264085222400, 20268952704000, 345226033152000, 6224529991680000, 118443913555968000, 2372079457972224000 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Numerators are unity for n>2.` `Same as A007680/2 for n>2.`
	LINKS	`Eric Weisstein's World of Mathematics, Erfi`
	FORMULA	`a(n)=(2n-1)(n-1)!/2 for n>2.`
	CROSSREFS	`Cf. A007680.` `Sequence in context: A110026 A056803 A071706 this_sequence A025093 A025112 A025098` `Adjacent sequences: A084250 A084251 A084252 this_sequence A084254 A084255 A084256`
	KEYWORD	`nonn,easy`
	AUTHOR	`Eric Weisstein (eric(AT)weisstein.com), May 23, 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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