A131897 A130321 + A131821 - A000012.

1, 3, 2, 6, 2, 3, 11, 4, 2, 4, 20, 8, 4, 2, 5, 37, 16, 8, 4, 2, 6, 70, 32, 16, 8, 4, 2, 7, 135, 64, 32, 16, 8, 4, 2, 8, 264, 128, 64, 32, 16, 8, 4, 2, 9, 521, 256, 128, 64, 32, 16, 8, 4, 2, 10

Offset

0,2

Comments

Left column = A006127: (1, 3, 6, 11, 20, 37, ...).

Row sums = A131898: (1, 5, 11, 21, 39, 73, ...).

Links

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

Formula

A131321 + A131821 - A000012 as infinite lower triangular matrices.

Example

First few rows of the triangle:
   1;
   3,  2;
   6,  2,  3;
  11,  4,  2,  4;
  20,  8,  4,  2,  5;
  37, 16,  8,  4,  2,  6;
  70, 32, 16,  8,  4,  2,  7;
  ...

Crossrefs

Cf. A130321, A131821, A006127, A131898.

Sequence in context: A133519 A135223 A143310 * A061187 A248082 A021758

Adjacent sequences: A131894 A131895 A131896 * A131898 A131899 A131900

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 25 2007

Status

approved