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

1,2

Comments

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

Links

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

Formula

A128174 * A129234 as infinite lower triangular matrices.

Example

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.

Sequence in context: A127528 A063070 A049802 * A246816 A127786 A030207

Adjacent sequences: A129237 A129238 A129239 * A129241 A129242 A129243

Keyword

nonn,tabl

Author

Gary W. Adamson, Apr 05 2007

Status

approved