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

Author

Gary W. Adamson, Feb 05 2008

Keywords

• nonn

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, ...).

Examples

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

Crossrefs

Cf. A137680, A137682.