A131231 3*A130296 - 2*A128174.

1, 6, 1, 7, 3, 1, 12, 1, 3, 1, 13, 3, 1, 3, 1, 18, 1, 3, 1, 3, 1, 19, 3, 1, 3, 1, 3, 1, 24, 1, 3, 1, 3, 1, 3, 1, 25, 3, 1, 3, 1, 3, 1, 3, 1

Offset: 1

Author

Gary W. Adamson, Jun 20 2007

Keywords

• nonn
• tabl

Comments

Left column = A047225, numbers congruent to {0,1} mod 6: (1, 6, 7, 12, 13, 18, 19, ...).

Row sums = A131229, numbers congruent to {1,7} mod 10: (1, 7, 11, 17, ...).

Examples

			First few rows of the triangle:
   1;
   6, 1;
   7, 3, 1;
  12, 1, 3, 1;
  13, 3, 1, 3, 1;
  ...
		

Crossrefs

Cf. A131229, A047225, A130296, A128174.

Formula

3*A130296 - 2*A128174 as infinite lower triangular matrices.