id:A026657 - OEIS Search Results

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Sum{T(i,j)}, 0<=i<=n, 0<=j<=n, T given by A026648.

+0
2

1, 3, 8, 18, 40, 84, 182, 378, 814, 1686, 3626, 7506, 16138, 33402, 71810, 148626, 319522, 661314, 1421714, 2942514, 6325906, 13092690, 28147058, 58255794, 125240050, 259208562, 557254322, 1153345842, 2479497394 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: [(1+2x)(1+x^2)]/[(1-x)(1-4x^2-2x^4)]. - R. Stephan, Apr 30 2004`
	CROSSREFS	`Sequence in context: A036385 A026635 A135094 this_sequence A036384 A080692 A117080` `Adjacent sequences: A026654 A026655 A026656 this_sequence A026658 A026659 A026660`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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