A131950 A002024 + A131821 + A007318 - 2*A000012 as infinite lower triangular matrices.

1, 3, 3, 5, 4, 5, 7, 6, 6, 7, 9, 8, 10, 8, 9, 11, 10, 15, 15, 10, 11, 13, 12, 21, 26, 21, 12, 13, 15, 14, 28, 42, 42, 28, 14, 15, 17, 16, 36, 64, 78, 64, 36, 16, 17, 19, 18, 45, 93, 135, 135, 93, 45, 18, 19

Offset: 0

Author

Gary W. Adamson, Jul 30 2007

Keywords

• nonn
• tabl

Comments

Row sums = A131951: (1, 6, 14, 26, 44, 72, ...).

Examples

			First few rows of the triangle:
   1;
   3,  3;
   5,  4,  5;
   7,  6,  6,  7;
   9,  8, 10,  8,  9;
  11, 10, 15, 15, 10, 11;
  13, 12, 21, 26, 21, 12, 13;
  15, 14, 28, 42, 42, 28, 14, 15;
  ...
		

Crossrefs

Cf. A002024, A131821, A007318, A000012, A131951.