id:A126965 - OEIS Search Results

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(2*n)!*(2*n-1)/(2^n*n!).

+0
2

-1, 1, 9, 75, 735, 8505, 114345, 1756755, 30405375, 585810225, 12439852425, 288735522075, 7273385294175, 197646339515625, 5763367260275625, 179518217255251875, 5948862302837829375, 208977775735174070625, 7757508341684492015625, 303429397707601987696875 (list; graph; listen)

	OFFSET	`0,3`
	REFERENCES	`V. van der Noort and N. J. A. Sloane, Paper in preparation, 2007.`
	FORMULA	`E.g.f.: (1-4x)^(1/2)/(1-2x).`
	CROSSREFS	`Cf. A001147.` `Sequence in context: A125397 A095249 A136659 this_sequence A066222 A080254 A056339` `Adjacent sequences: A126962 A126963 A126964 this_sequence A126966 A126967 A126968`
	KEYWORD	`sign`
	AUTHOR	`njas, Mar 21 2007`

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

AT&T Labs Research