A129240 A128174 * A129234.

1, 2, 2, 4, 0, 3, 6, 5, 0, 4, 9, 0, 3, 0, 5, 12, 9, 4, 4, 0, 6, 16, 0, 3, 0, 5, 0, 7, 20, 14, 4, 9, 0, 6, 0, 8, 25, 0, 8, 0, 5, 0, 7, 0, 9, 30, 20, 4, 9, 6, 6, 0, 8, 0, 10

Offset: 1

Author

Gary W. Adamson, Apr 05 2007

Keywords

• nonn
• tabl

Comments

Left border = A002620 starting (1, 2, 4, 6, 9, 12, 16, ...).

Examples

			First few rows of the triangle:
   1;
   2, 2;
   4, 0, 3;
   6, 5, 0, 4;
   9, 0, 3, 0, 5;
  12, 9, 4, 4, 0, 6;
  16, 0, 3, 0, 5, 0, 7;
  ...
		

Crossrefs

Cf. A128174, A129234, A002620.

Formula

A128174 * A129234 as infinite lower triangular matrices.