A131784 Triangle read by rows: (A004736 + A002260 - I) * A000012.

1, 5, 2, 11, 7, 3, 19, 14, 9, 4, 29, 23, 17, 11, 5, 41, 34, 27, 20, 13, 6, 55, 47, 39, 31, 23, 15, 7, 71, 62, 53, 44, 35, 26, 17, 8, 89, 79, 69, 59, 49, 39, 29, 19, 9, 109, 98, 87, 76, 65, 54, 43, 32, 21, 10, 131, 119, 107, 95, 83, 71, 59, 47, 35, 23, 11, 155, 142, 129, 116, 103, 90, 77, 64, 51, 38, 25, 12

Offset: 1

Author

Gary W. Adamson, Jul 16 2007

Keywords

• nonn
• tabl

Examples

			First few rows of the triangle:
   1;
   5,  2;
  11,  7,  3;
  19, 14,  9,  4;
  29, 23, 17, 11,  5;
  41, 34, 27, 20, 13,  6;
  55, 47, 39, 31, 23, 15,  7;
  ...
		

Crossrefs

Cf. A004736, A002260, A127736 (row sums), A028387 (left column).

Formula

Equals (A004736 + A002260 - I) * A000012, I = Identity matrix.

Extensions

a(35) corrected and more terms from Georg Fischer, Aug 09 2023