A132048 3*A007318 - A103451 - A000012.

1, 1, 1, 1, 5, 1, 1, 8, 8, 1, 1, 11, 17, 11, 1, 1, 14, 29, 29, 14, 1, 1, 17, 44, 59, 44, 17, 1, 1, 20, 62, 104, 104, 62, 20, 1, 1, 23, 83, 167, 209, 167, 83, 23, 1, 1, 26, 107, 251, 377, 377, 251, 107, 26, 1

Offset

0,5

Comments

Row sums = A077802: (1, 2, 7, 18, 41, 88, ...).

Links

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

Formula

3*A007318 - A103451 - A000012 as infinite lower triangular matrices.

Example

First few rows of the triangle:
  1;
  1,  1;
  1,  5,  1;
  1,  8,  8,  1;
  1, 11, 17, 11,  1;
  1, 14, 29, 29, 14,  1;
  1, 17, 44, 59, 44, 17,  1;
  ...

Crossrefs

Cf. A007318, A103451, A000012, A077802.

Sequence in context: A294296 A078181 A054110 * A141398 A058281 A046583

Adjacent sequences: A132045 A132046 A132047 * A132049 A132050 A132051

Keyword

nonn,tabl

Author

Gary W. Adamson, Aug 08 2007

Status

approved