A136787 Triangle read by rows: A107131 * A000012.

1, 1, 1, 2, 2, 1, 4, 4, 4, 1, 9, 9, 9, 7, 1, 21, 21, 21, 21, 11, 1, 51, 51, 51, 51, 46, 16, 1, 127, 127, 127, 127, 127, 92, 22, 1, 323, 323, 323, 323, 323, 309, 169, 29, 1, 835, 835, 835, 835, 835, 835, 709, 289, 37, 1

Offset

1,4

Comments

Row sums = A005773 starting (1, 2, 5, 13, 35, 96, 267, ...).

Leftmost column = A001006: (1, 1, 2, 4, 9, 21, 51, ...).

A136788 = A000012 * A107131.

Links

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

Formula

A107131 * A000012 as infinite lower triangular matrices.

Example

First few rows of the triangle:
    1;
    1,   1;
    2,   2,   1;
    4,   4,   4,   1;
    9,   9,   9,   7,   1;
   21,  21,  21,  21,  11,  1;
   51,  51,  51,  51,  46, 16,  1;
  127, 127, 127, 127, 127, 92, 22, 1;
  ...

Crossrefs

Cf. A005773, A001006, A136788.

Sequence in context: A061436 A214095 A213948 * A165038 A305191 A261357

Adjacent sequences: A136784 A136785 A136786 * A136788 A136789 A136790

Keyword

nonn,tabl

Author

Gary W. Adamson, Jan 21 2008

Status

approved