id:A091527 - OEIS Search Results

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a(n) = ((3n)!/n!^2)(gamma(1+n/2)/gamma(1+3n/2)).

+0
2

1, 4, 30, 256, 2310, 21504, 204204, 1966080, 19122246, 187432960, 1848483780, 18320719872, 182327718300, 1820797698048, 18236779032600, 183120225632256, 1842826521244230, 18581317012684800, 187679234340049620 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`n(n-1)a(n)=12(3n-1)(3n-5)a(n-2).`
	PROGRAM	`(PARI) a(n)=4^n*sum(i=0, n, binomial(i-1+(n-1)/2, i))`
	CROSSREFS	`Cf. A061162(n)=a(2n).` `Sequence in context: A052604 A038225 A086452 this_sequence A102307 A052658 A127130` `Adjacent sequences: A091524 A091525 A091526 this_sequence A091528 A091529 A091530`
	KEYWORD	`nonn`
	AUTHOR	`Michael Somos, Jan 18 2004`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

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