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Search: id:A026690
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A026690 a(n) = Sum{T(i,j)}, 0<=i<=n, 0<=j<=n, T given by A026681. +0
1
1, 3, 8, 20, 46, 100, 220, 496, 1102, 2390, 5242, 11726, 25982, 56524, 124092, 276898, 613052, 1336324, 2935674, 6541128, 14475308, 31594190, 69437408, 154561826, 341929544, 747004042, 1642277456, 3652837124, 8079030958 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A140481 A027928 A026624 this_sequence A036676 A101533 A138803

Adjacent sequences: A026687 A026688 A026689 this_sequence A026691 A026692 A026693

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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