A134446 A128174 * A002260.

1, 1, 2, 2, 2, 3, 2, 4, 3, 4, 3, 4, 6, 4, 5, 3, 6, 6, 8, 5, 6, 4, 6, 9, 8, 10, 6, 7, 4, 8, 9, 12, 10, 12, 7, 8, 5, 8, 12, 12, 15, 12, 14, 8, 9, 5, 10, 12, 16, 15, 18, 14, 16, 9, 10

Offset

1,3

Comments

Row sums = A002623: (1, 3, 7, 13, 22, 34, ...).

Links

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

Formula

A128174 * A002260 as infinite lower triangular matrices.

Example

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

Crossrefs

Cf. A002260, A128174, A002623.

Sequence in context: A126336 A364421 A352631 * A125749 A014085 A248891

Adjacent sequences: A134443 A134444 A134445 * A134447 A134448 A134449

Keyword

nonn,tabl

Author

Gary W. Adamson, Oct 25 2007

Status

approved