A137593 Triangle read by rows: matrix product A000012 * A136717.

1, 1, 2, 1, 4, 4, 1, 4, 16, 12, 1, 4, 16, 84, 48, 1, 4, 16, 156, 504, 192, 1, 4, 16, 156, 1464, 3312, 960, 1, 4, 16, 156, 1464, 14112, 24720, 5760, 1, 4, 16, 156, 1464, 24912, 158640, 189360, 34560, 1, 4, 16, 156, 1464, 24912, 400560, 1761840, 1607040, 241920

Offset: 1

Author

Gary W. Adamson, Jan 28 2008

Keywords

• nonn
• tabl

Comments

Right border = A004527: (1, 2, 4, 12, 48, 192, ...).

Row sums = A007489 starting (1, 3, 9, 33, 153, ...).

Examples

			First few rows of the triangle:
  1;
  1, 2;
  1, 4,  4;
  1, 4, 16,  12;
  1, 4, 16,  84,   48;
  1, 4, 16, 156,  504,  192;
  1, 4, 16, 156, 1464, 3312, 960;
  ...
		

Crossrefs

Cf. A136717, A004527, A007489.

Formula

A000012 * A136717 as infinite lower triangular matrices.

Extensions

Typo in eighth row corrected by Olivier Gérard, Oct 30 2012