A131832 2*(A131830) - A000012.

1, 3, 3, 5, 3, 5, 7, 5, 5, 7, 9, 7, 11, 7, 9, 11, 9, 19, 19, 9, 11, 13, 11, 29, 39, 29, 11, 13, 15, 13, 41, 69, 69, 41, 13, 15, 17, 15, 55, 111, 139, 111, 55, 15, 17, 19, 17, 71, 167, 251, 251, 167, 71, 17, 19

Offset

0,2

Comments

Row sums = A131833: (1, 6, 13, 24, 43, 78, ...).

Links

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

Formula

2*(A131810) - A000012 as infinite lower triangular matrices.

Example

First few rows of the triangle:
   1;
   3,  3;
   5,  3,  5;
   7,  5,  5,  7;
   9,  7, 11,  7,  9;
  11,  9, 19, 19,  9, 11;
  13, 11, 29, 39, 29, 11, 13;
  15, 13, 41, 69, 69, 41, 13, 15;
  ...

Crossrefs

Cf. A131830, A131833.

Sequence in context: A131919 A185154 A204022 * A255316 A078587 A335074

Adjacent sequences: A131829 A131830 A131831 * A131833 A131834 A131835

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 20 2007

Status

approved