id:A000909 - OEIS Search Results

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(2n)!(2n+1)! / n!^2.

+0
2

1, 12, 720, 100800, 25401600, 10059033600, 5753767219200, 4487938430976000, 4577697199595520000, 5914384781877411840000, 9439358111876349296640000, 18236839872145106841108480000, 41944731705933745734549504000000 (list; graph; listen)

	OFFSET	`0,2`
	REFERENCES	`E. R. Hansen, A Table of Series and Products, Prentice-Hall, Englewood Cliffs, NJ, 1975, p. 96.`
	CROSSREFS	`a(n) = 4^n * A079484(n+1).` `Sequence in context: A071307 A060612 A002196 this_sequence A061025 A042749 A089036` `Adjacent sequences: A000906 A000907 A000908 this_sequence A000910 A000911 A000912`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research