A133981 Triangle read by rows: A000012 * A127701 + A127701 * A000012 - A000012 as infinite lower triangular matrices.

1, 4, 3, 5, 6, 5, 6, 7, 8, 7, 7, 8, 9, 10, 9, 8, 9, 10, 11, 12, 11, 9, 10, 11, 12, 13, 14, 13, 10, 11, 12, 13, 14, 15, 16, 15, 11, 12, 13, 14, 15, 16, 17, 18, 17, 12, 13, 14, 15, 16, 17, 18, 19, 20, 19, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 21, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 23

Offset: 1

Author

Gary W. Adamson, Sep 30 2007

Keywords

• nonn
• tabl

Comments

Row sums = A133694: (1, 7, 16, 28, 43, 61, ...).

Examples

			First few rows of the triangle:
   1;
   4,  3;
   5,  6,  5;
   6,  7,  8,  7;
   7,  8,  9, 10,  9;
   8,  9, 10, 11, 12, 11;
   9, 10, 11, 12, 13, 14, 13;
  10, 11, 12, 13, 14, 15, 16, 15;
  11, 12, 13, 14, 15, 16, 17, 18, 17;
  ...
		

Crossrefs

Cf. A127701, A133694.

Extensions

a(26) = 13 corrected and more terms from Georg Fischer, Jun 07 2023