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

Offset: 1

Author

Gary W. Adamson, Aug 29 2007

Keywords

• nonn
• tabl

Comments

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

Examples

			First few rows of the triangle:
  1;
  3, 2;
  5, 5, 3;
  7, 7, 7, 4;
  9, 9, 9, 9, 5;
  ...
		

Crossrefs

Cf. A001844, A003506, A007318.

Formula

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

Extensions

Spurious extra term after a(44) deleted and more terms from Georg Fischer, Jun 02 2023