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

0,2

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, ...).

Links

Table of n, a(n) for n=0..104.

Example

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.

Sequence in context: A244209 A156279 A203072 * A220130 A276071 A040059

Adjacent sequences: A131870 A131871 A131872 * A131874 A131875 A131876

Keyword

nonn,tabl,changed

Author

Gary W. Adamson, Jul 22 2007

Extensions

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

Status

approved