A134544 A051731 * A002260.

1, 2, 2, 2, 2, 3, 3, 4, 3, 4, 2, 2, 3, 4, 5, 4, 6, 6, 4, 5, 6, 2, 2, 3, 4, 5, 6, 7, 4, 6, 6, 8, 5, 6, 7, 8, 3, 4, 6, 4, 5, 6, 7, 8, 9, 4, 6, 6, 8, 10, 6, 7, 8, 9, 10

Offset

1,2

Comments

Row sums = A007437: (1, 4, 7, 14, 16, 3, 29, 50, ...).

Left border = A000010.

Links

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

Formula

A051731 * A002260 as infinite lower triangular matrices.

Example

First few rows of the triangle:
  1;
  2,  2;
  2,  2,  3;
  3,  4,  3,  4;
  2,  2,  3,  4,  5;
  4,  6,  6,  4,  5,  6;
  2,  2,  3,  4,  5,  6,  7;
  4,  6,  6,  8,  5,  6,  7,  8;
  3,  4,  6,  4,  5,  6,  7,  8,  9;
  4,  6,  6,  8, 10,  6,  7,  8,  9, 10;
  ...

Crossrefs

Cf. A054731, A007437, A000010.

Sequence in context: A333701 A140682 A049317 * A230514 A106161 A105588

Adjacent sequences: A134541 A134542 A134543 * A134545 A134546 A134547

Keyword

nonn,tabl,more

Author

Gary W. Adamson, Oct 31 2007

Status

approved