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A026690
a(n) = Sum{T(i,j)}, 0<=i<=n, 0<=j<=n, T given by A026681.
0
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
OFFSET
0,2
CROSSREFS
Sequence in context: A140481 A027928 A026624 * A036676 A101533 A138803
KEYWORD
nonn
STATUS
approved