A128142 A128132 * A122432 (unsigned).

1, 5, 2, 15, 8, 3, 34, 21, 11, 4, 65, 44, 27, 14, 5, 111, 80, 54, 33, 17, 6, 175, 132, 95, 64, 39, 20, 7, 260, 203, 153, 110, 74, 45, 23, 8, 369, 296, 231, 174, 125, 84, 51, 26, 9, 505, 414, 332, 259, 195, 140, 94, 57, 29, 10

Offset

1,2

Comments

Row sums = A006325 starting (1, 7, 26, 70, 155, ...).

Left border = A006003: (1, 5, 15, 34, 65, 111, ...).

A128141 = A122432 * A128132.

Links

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

Formula

A128132 * A122432 (unsigned); as infinite lower triangular matrices.

Example

First few rows of the triangle:
    1;
    5,   2;
   15,   8,  3;
   34,  21, 11,  4;
   65,  44, 27, 14,  5;
  111,  80, 54, 33, 17,  6;
  175, 132, 95, 64, 39, 20,  7;
  ...

Crossrefs

Cf. A128132, A122432, A006325, A128141, A006003.

Sequence in context: A341515 A191722 A191435 * A213550 A283242 A246209

Adjacent sequences: A128139 A128140 A128141 * A128143 A128144 A128145

Keyword

nonn,tabl

Author

Gary W. Adamson, Feb 16 2007

Status

approved