A131034 A129686 * A051340.

1, 2, 1, 4, 1, 1, 6, 2, 1, 1, 8, 2, 2, 1, 1, 10, 2, 2, 2, 1, 12, 2, 2, 2, 2, 1, 1, 14, 2, 2, 2, 2, 2, 1, 1, 16, 2, 2, 2, 2, 2, 2, 1, 1

Offset

0,2

Comments

Row sums = A113127: (1, 3, 6, 10, 14, 18, 22, ...).

Links

Table of n, a(n) for n=0..43.

Formula

A129686 * A051340 as infinite lower triangular matrices.

Example

First few rows of the triangle:
   1;
   2, 1;
   4, 1, 1;
   6, 2, 1, 1;
   8, 2, 2, 1, 1;
  10, 2, 2, 2, 1, 1;
  ...

Crossrefs

Cf. A129686, A051340, A113127.

Sequence in context: A339833 A118745 A235671 * A346873 A130313 A247073

Adjacent sequences: A131031 A131032 A131033 * A131035 A131036 A131037

Keyword

nonn,tabl

Author

Gary W. Adamson, Jun 10 2007

Status

approved