id:A072975 - OEIS Search Results

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a(n)=2^n*binomial(3*n,n)*(3*n+1).

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1, 24, 420, 6720, 102960, 1537536, 22573824, 327444480, 4707014400, 67190323200, 953748956160, 13476348887040, 189694258790400, 2661556369489920, 37240665709608960, 519828326870679552 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`sum(k>=0, 1/a(k) ) = ( Pi+3*Log(2) )/5 =1.04420683905392583334286...`
	PROGRAM	`(PARI) a(n)=2^nbinomial(3n, n)(3n+1)`
	CROSSREFS	`Sequence in context: A021304 A018092 A016326 this_sequence A062193 A016268 A051546` `Adjacent sequences: A072972 A072973 A072974 this_sequence A072976 A072977 A072978`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 13 2002`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

AT&T Labs Research