A134390 Duplicate of A131416.

1, 4, 3, 8, 8, 5, 13, 14, 12, 7, 19, 21, 20, 16, 9, 26, 29, 29, 26, 20, 11, 34, 38, 39, 37, 32, 24, 13, 43, 48, 50, 49, 45, 38, 28, 15, 53, 59, 62, 62, 59, 53, 44, 32, 17, 64, 71, 75, 76, 74, 69, 61, 50, 36, 19, 76, 84, 89, 91, 90, 86, 79, 69, 56, 40, 21, 89, 98, 104, 107, 107, 104, 98, 89, 77, 62, 44, 23

Offset: 1

Author

Gary W. Adamson, Oct 23 2007

Keywords

• dead

Comments

Row sums = A127736: (1, 7, 21, 46, 85, 141, 217, ...).

Examples

			First few rows of the triangle:
   1;
   4,  3;
   8,  8,  5;
  13, 14, 12,  7;
  19, 21, 20, 16,  9;
  26, 29, 29, 26, 20, 11;
  ...
		

Crossrefs

Cf. A002260, A127736.

Formula

(A000012 * A002260 + A002260 * A000012) - A000012 as infinite lower triangular matrices; where A000012 = (1; 1,1; 1,1,1; ...) and A002260 = (1; 1,2; 1,2,3; ...).

Extensions

a(6) corrected and more terms from Georg Fischer, Jun 05 2023