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

1,2

Comments

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

Links

Table of n, a(n) for n=1..55.

Example

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.

Sequence in context: A138123 A328382 A211868 * A350950 A051171 A336118

Adjacent sequences: A127369 A127370 A127371 * A127373 A127374 A127375

Keyword

nonn,tabl

Author

Gary W. Adamson, Jan 12 2007

Extensions

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

Status

approved