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A026657 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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