id:A131928 - OEIS Search Results

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A131928

Phi(binomial(2*n,n)*n).

+0
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0, 1, 4, 16, 96, 288, 1440, 5760, 23040, 92160, 552960, 1658880, 7299072, 36495360, 109486080, 510935040, 2043740160, 7664025600, 28740096000, 114960384000, 459841536000, 1839366144000, 8583708672000, 38626689024000 (list; graph; listen)

	OFFSET	`0,3`
	MAPLE	`with(numtheory):with(combinat):a:=n->phi(binomial(2n, n)n): seq(a(n), n=0..25);`
	CROSSREFS	`Cf. A005430 Apery numbers: n*C(2n,n).` `Sequence in context: A111291 A050913 A096243 this_sequence A098580 A027745 A032184` `Adjacent sequences: A131925 A131926 A131927 this_sequence A131929 A131930 A131931`
	KEYWORD	`nonn`
	AUTHOR	`Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 05 2007`

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

AT&T Labs Research