A131873 Right-to-left partial row sums of triangle A131844.

1, 8, 4, 15, 8, 7, 22, 12, 11, 10, 29, 16, 15, 14, 13, 36, 20, 19, 18, 17, 16, 43, 24, 23, 22, 21, 20, 19, 50, 28, 27, 26, 25, 24, 23, 22, 57, 32, 31, 30, 29, 28, 27, 26, 25, 64, 36, 35, 34, 33, 32, 31, 30, 29, 28, 71, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 78, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 85, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 92, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40

Offset: 0

Author

Gary W. Adamson, Jul 22 2007

Keywords

• nonn
• tabl

Comments

Left column = A016993, 7n + 1: (1, 8, 15, 22, 29, ...).

Right border = 3n + 1: (1, 4, 7, 10, 13, ...).

Row sums = A131874: (1, 12, 30, 55, ...).

Examples

			First few rows of the triangle:
   1;
   8,  4;
  15,  8,  7;
  22, 12, 11, 10;
  29, 16, 15, 14, 13;
  36, 20, 19, 18, 17, 16;
  43, 24, 23, 22, 21, 20, 19;
  ...
Row 4 of A131844 is 13, 1, 1, 1, 13, so row 4 of this sequence is 29, 16, 15, 14, 13.
		

Crossrefs

Cf. A131844, A131874, A016993, A131875.

Extensions

Definition corrected and more terms added by Russ Cox, Apr 18 2024