A131873 - OEIS

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

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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:

8, 4;