A132778 - OEIS

A132778

Triangle read by rows, n-1 terms of (2n - 1) followed by n.

1, 3, 2, 5, 5, 3, 7, 7, 7, 4, 9, 9, 9, 9, 5, 11, 11, 11, 11, 11, 6, 13, 13, 13, 13, 13, 13, 7, 15, 15, 15, 15, 15, 15, 15, 8, 17, 17, 17, 17, 17, 17, 17, 17, 9, 19, 19, 19, 19, 19, 19, 19, 19, 19, 10, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 11, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 12

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OFFSET

1,2

COMMENTS

Row sums = A001844: (1, 5, 13, 25, 41, 61, ...).

LINKS

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

FORMULA

A007318^(-1) * [A003506 * A000012], as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle:

3, 2;