A131919 A002024 + A131821 - A000012.

1, 3, 3, 5, 3, 5, 7, 4, 4, 7, 9, 5, 5, 5, 9, 11, 6, 6, 6, 6, 11, 13, 7, 7, 7, 7, 7, 13, 15, 8, 8, 8, 8, 8, 8, 15, 17, 9, 9, 9, 9, 9, 9, 9, 17, 19, 10, 10, 10, 10, 10, 10, 10, 10, 19

Offset

0,2

Comments

Row sums = A028872: (1, 6, 13, 22, 33, 46, ...).

Links

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

Formula

A002024 + A131821 - A000012 as infinite lower triangular matrices.

Example

First few rows of the triangle:
   1;
   3, 3;
   5, 3, 5;
   7, 4, 4, 7;
   9, 5, 5, 5, 9;
  11, 6, 6, 6, 6, 11;
  13, 7, 7, 7, 7,  7, 13;
  ...

Crossrefs

Cf. A002024, A131821, A000012, A028872.

Sequence in context: A233793 A158894 A352445 * A185154 A204022 A131832

Adjacent sequences: A131916 A131917 A131918 * A131920 A131921 A131922

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 28 2007

Status

approved