A136788 Triangle read by rows: A000012 * A107131.

1, 1, 1, 1, 2, 1, 1, 2, 4, 1, 1, 2, 6, 7, 1, 1, 2, 6, 17, 11, 1, 1, 2, 6, 22, 41, 16, 1, 1, 2, 6, 22, 76, 86, 22, 1, 1, 2, 6, 22, 90, 226, 162, 29, 1, 1, 2, 6, 22, 90, 352, 582, 281, 37, 1

Offset

0,5

Comments

Row sums = A086615: (1, 2, 4, 8, 17, 38, ...).

A136787 = A107131 * A000012.

Links

Table of n, a(n) for n=0..54.

Formula

A000012 * A107131 as infinite lower triangular matrices.

Example

First few rows of the triangle:
  1;
  1, 1;
  1, 2, 1;
  1, 2, 4,  1;
  1, 2, 6,  7,  1;
  1, 2, 6, 17, 11,  1;
  1, 2, 6, 22, 41, 16,  1;
  1, 2, 6, 22, 76, 86, 22, 1;
  ...

Crossrefs

Cf. A086615, A136787.

Sequence in context: A371823 A373778 A110971 * A334622 A136450 A387156

Adjacent sequences: A136785 A136786 A136787 * A136789 A136790 A136791

Keyword

nonn,tabl,more

Author

Gary W. Adamson, Jan 21 2008

Status

approved