A133115 - OEIS

A133115

Triangle read by rows: 2*A133113 - A000012 as infinite lower triangular matrices.

1, 3, 1, 7, 3, 1, 11, 7, 7, 1, 17, 11, 21, 7, 1, 23, 17, 47, 21, 11, 1, 31, 23, 91, 47, 43, 11, 1, 39, 31, 159, 91, 123, 43, 15, 1, 49, 39, 259, 159, 295, 123, 73, 15, 1, 59, 49, 399, 259, 627, 295, 255, 73, 19, 1, 71, 59, 589, 399, 1219, 627, 733, 255, 111, 19, 1, 83, 71, 839, 589, 2211, 1219, 1839, 733, 459, 111, 23, 1

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OFFSET

1,2

COMMENTS

Left column = A047838: (1, 3, 7, 11, 17, 23, ...).

Row sums = A000295: (1, 4, 11, 26, 57, ...).

LINKS

Table of n, a(n) for n=1..78.

EXAMPLE

First few rows of the triangle:

3, 1;

7, 3, 1;