A128807 A115361 * A007318.

1, 2, 1, 1, 2, 1, 3, 4, 3, 1, 1, 4, 6, 4, 1, 2, 7, 11, 10, 5, 1, 1, 6, 15, 20, 15, 6, 1, 4, 11, 24, 36, 35, 21, 7, 1, 1, 8, 28, 56, 70, 56, 28, 8, 1, 2, 13, 42, 88, 127, 126, 84, 36, 9, 1

Offset

0,2

Comments

Row sums = A127804: (1, 3, 4, 11, 16, 36, 64, ...). Left column = the Ruler sequence, A001511: (1, 2, 1, 3, 1, 2, 1, 4, ...). A129262 = A007318 * A115361.

Links

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

Formula

A115361 * A007318 as infinite lower triangular matrices.

Example

First few rows of the triangle:
  1;
  2,  1;
  1,  2,  1;
  3,  4,  3,  1;
  1,  4,  6,  4,  1;
  2,  7, 11, 10,  5,  1;
  1,  6, 15, 20, 15,  6,  1;
  4, 11, 24, 36, 35, 21,  7,  1;
  ...

Crossrefs

Cf. A115361, A007318, A129262, A001511, A127804.

Sequence in context: A233322 A233324 A268679 * A309035 A071628 A033809

Adjacent sequences: A128804 A128805 A128806 * A128808 A128809 A128810

Keyword

nonn,tabl

Author

Gary W. Adamson, Apr 06 2007

Status

approved