A127372 Triangle read by rows: A127170 * A054521 as infinite lower triangular matrices.

1, 3, 0, 3, 1, 0, 6, 0, 1, 0, 3, 1, 1, 1, 0, 9, 2, 0, 0, 1, 0, 3, 1, 1, 1, 1, 1, 0, 10, 0, 3, 0, 1, 0, 1, 0, 6, 3, 0, 1, 1, 0, 1, 1, 0, 9, 2, 3, 2, 0, 0, 1, 0, 1, 0

Offset: 1

Author

Gary W. Adamson, Jan 12 2007

Keywords

• nonn
• tabl

Comments

Left column = A007425, (tau_3(n)): 1, 3, 3, 6, 3, 9, ... Row sums = sigma(n), A000203: 1, 3, 4, 7, 6, 12, ...

Examples

			First few rows of the triangle:
   1;
   3, 0;
   3, 1, 0;
   6, 0, 1, 0;
   3, 1, 1, 1, 0;
   9, 2, 0, 0, 1, 0;
   3, 1, 1, 1, 1, 1, 0;
  10, 0, 3, 0, 1, 0, 1, 0;
  ...
		

Crossrefs

Cf. A127170, A054521, A000203, A007425.

Extensions

Edited by N. J. A. Sloane, Jul 11 2008