A134397 A077018 * A007318.

1, 2, 1, 4, 4, 1, 8, 12, 6, 1, 15, 30, 23, 8, 1, 26, 65, 68, 37, 10, 1, 42, 126, 168, 126, 54, 12, 1, 64, 224, 364, 350, 208, 74, 14, 1, 93, 372, 714, 840, 642, 318, 97, 16, 1, 130, 585, 1296, 1806, 1692, 1080, 460, 123, 18, 1

Offset

0,2

Comments

Row sums = A048481: (1, 3, 9, 27, 77, 207, 529, ...).

Links

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

Formula

A077018 * A007318 as infinite lower triangular matrices.

Example

First few rows of the triangle:
   1;
   2,   1;
   4,   4,   1;
   8,  12,   6,   1;
  15,  30,  23,   8,  1;
  26,  65,  68,  37, 10,  1;
  42, 126, 168, 126, 54, 12, 1;
  ...

Crossrefs

Cf. A077018, A048481.

Sequence in context: A140693 A131249 A048807 * A134395 A065109 A038207

Adjacent sequences: A134394 A134395 A134396 * A134398 A134399 A134400

Keyword

nonn,tabl

Author

Gary W. Adamson, Oct 23 2007

Status

approved