A132478 A007318^(-1) * [4*A007318^(2) - 3*A000012].

1, 4, 1, 4, 11, 1, 4, 9, 18, 1, 4, 19, 15, 25, 1, 4, 17, 52, 22, 32, 1, 4, 27, 45, 110, 30, 39, 1, 4, 25, 102, 95, 200, 39, 46, 1, 4, 35, 91, 287, 175, 329, 49, 53, 1, 4, 33, 168, 252, 672, 294, 504, 60, 60, 1

Offset

0,2

Comments

Row sums = A132479: (1, 5, 16, 32, 64, 128, 256, ...).

Links

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

Formula

Inverse binomial transform of [4*A007318^(2) - 3*A000012], as infinite lower triangular matrices.

Example

First few rows of the triangle:
  1;
  4,  1;
  4, 11,  1;
  4,  9, 18,   1;
  4, 19, 15,  25,  1;
  4, 17, 52,  22, 32,  1;
  4, 27, 45, 110, 30, 39, 1;
  ...

Crossrefs

Cf. A007318, A132479.

Sequence in context: A208527 A209576 A055886 * A208918 A228782 A205125

Adjacent sequences: A132475 A132476 A132477 * A132479 A132480 A132481

Keyword

nonn,tabl

Author

Gary W. Adamson, Aug 23 2007

Status

approved