A132307 2*A007318^(2) - A000012.

1, 3, 1, 7, 7, 1, 15, 23, 11, 1, 31, 63, 47, 15, 1, 63, 159, 159, 79, 19, 1, 127, 383, 479, 319, 119, 23, 1, 255, 895, 1343, 1119, 559, 167, 27, 1, 511, 2047, 3583, 3583, 2239, 895, 223, 31, 1, 1023, 4607, 9215, 10751, 8063, 4031, 1343, 287, 35, 1

Offset

0,2

Comments

Row sums = A132308: (1, 4, 15, 50, 157, 480, 1451, ...). Inverse binomial transform of A132307 = triangle A132309 (having row sums A077552).

Links

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

Formula

2*A007318^(2) - A000012 as infinite lower triangular matrices.

Example

First few rows of the triangle:
   1;
   3,   1;
   7,   7,   1;
  15,  23,  11,  1;
  31,  63,  47, 15,  1;
  63, 159, 159, 79, 19, 1;
  ...

Crossrefs

Cf. A132308, A132309, A077552.

Sequence in context: A082053 A322753 A136035 * A372968 A188463 A369892

Adjacent sequences: A132304 A132305 A132306 * A132308 A132309 A132310

Keyword

nonn,tabl

Author

Gary W. Adamson, Aug 18 2007

Status

approved