A137629 Triangle read by rows, A026794^2.

1, 2, 1, 4, 0, 1, 7, 2, 0, 1, 11, 2, 0, 0, 1, 18, 4, 2, 0, 0, 1, 26, 4, 2, 0, 0, 0, 1, 39, 9, 2, 2, 0, 0, 0, 1, 55, 9, 4, 2, 0, 0, 0, 0, 1, 79, 16, 4, 2, 2, 0, 0, 0, 0, 1, 106, 18, 6, 2, 2, 0, 0, 0, 0, 0, 1, 150, 29, 9, 4, 2, 2, 0, 0, 0, 0, 0, 1

Offset

1,2

Comments

Row sums = A137630: (1, 3, 5, 10, 14, 25, 33, 53, 71, 104, ...).

Left border = A137631: (1, 2, 4, 7, 11, 18, 26, 39, 55, 79, ...).

Links

Table of n, a(n) for n=1..78.

Formula

Square of the partition triangle.

Example

First few rows of the triangle:
   1;
   2, 1;
   4, 0, 1;
   7, 2, 0, 1;
  11, 2, 0, 0, 1;
  18, 4, 2, 0, 0, 1;
  26, 4, 2, 0, 0, 0, 1;
  39, 9, 2, 2, 0, 0, 0, 1;
  ...

Crossrefs

Cf. A026794, A137630, A137631.

Sequence in context: A122141 A091604 A200192 * A220504 A087569 A341509

Adjacent sequences: A137626 A137627 A137628 * A137630 A137631 A137632

Keyword

nonn,tabl

Author

Gary W. Adamson, Jan 31 2008

Status

approved