id:A157024 - OEIS Search Results

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a(0)=1, a(n)=(3n-1)3n(3n+1)/2 for n>0

+0
2

1, 12, 105, 360, 858, 1680, 2907, 4620, 6900, 9828, 13485, 17952, 23310, 29640, 37023, 45540, 55272, 66300, 78705, 92568, 107970, 124992, 143715, 164220, 186588, 210900, 237237, 265680, 296310, 329208, 364455, 402132, 442320, 485100, 530553 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Sum(n>=0,1/a(n))=log(3)`
	FORMULA	`G.f.: (1+8x+63x^2+8x^3+x^4)/(1-x)^4` `a(n)=A027480(3n-1), n>0. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 07 2009]`
	CROSSREFS	`Cf.: A002391, A058962, A097321, A154920.` `Sequence in context: A024454 A003431 A094530 this_sequence A051815 A004321 A016223` `Adjacent sequences: A157021 A157022 A157023 this_sequence A157025 A157026 A157027`
	KEYWORD	`nonn`
	AUTHOR	`Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Feb 21 2009`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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