A026690 a(n) = Sum{T(i,j)}, 0<=i<=n, 0<=j<=n, T given by A026681.

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

Links

Table of n, a(n) for n=0..28.

Crossrefs

Sequence in context: A140481 A027928 A026624 * A036676 A101533 A138803

Adjacent sequences: A026687 A026688 A026689 * A026691 A026692 A026693

Keyword

nonn

Author

Clark Kimberling

Status

approved