id:A072976 - OEIS Search Results

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

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1, 30, 480, 7392, 110880, 1633632, 23761920, 342328320, 4895294976, 69589977600, 984515051520, 13872712089600, 194821130649600, 2728095278727168, 38106727702855680, 531128942672216064 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`sum(k>=0, 1/a(k) ) = ( 7Pi -24Log(2) )/10 = 0.53556162416898...`
	PROGRAM	`(PARI) a(n)=2^nbinomial(3n, n)(3n+2)`
	CROSSREFS	`Sequence in context: A022594 A004416 A125487 this_sequence A127544 A133927 A082556` `Adjacent sequences: A072973 A072974 A072975 this_sequence A072977 A072978 A072979`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 13 2002`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

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