A137681 Row sums of triangle A137680.

1, 2, 4, 10, 23, 56, 132, 316, 752, 1793, 4272, 10183, 24266, 57833, 137828, 328475, 782827, 1865651, 4446255, 10596406, 25253567, 60184809, 143433647, 341833954, 814665553, 1941527332, 4627086990, 11027366781, 26280642313, 62632555360, 149267165702

Offset

1,2

Comments

Partial sums of A137681 prefaced with a 1 = left border of triangle A137680: (1, 1, 3, 7, 17, 40, 96, 228, ...) = A137682. A variation of A137681 = column 2 of triangle A137680: (1, 0, 2, 4, 10, 23, 56, 132, 316, ...).

Links

Table of n, a(n) for n=1..31.

Example

a(4) = 10 = sum of row 4 terms of triangle A137680: (7 + 2 + 0 + 1).

Crossrefs

Cf. A137680, A137682.

Sequence in context: A191693 A238436 A366229 * A127389 A152173 A032171

Adjacent sequences: A137678 A137679 A137680 * A137682 A137683 A137684

Keyword

nonn

Author

Gary W. Adamson, Feb 05 2008

Status

approved