A133728 A128174 * A127775.

1, 0, 3, 1, 0, 5, 0, 3, 0, 7, 1, 0, 5, 0, 9, 0, 3, 0, 7, 0, 11, 1, 0, 5, 0, 9, 0, 13, 0, 3, 0, 7, 0, 11, 0, 15, 1, 0, 5, 0, 9, 0, 13, 0, 17, 0, 3, 0, 7, 0, 11, 0, 15, 0, 19, 1, 0, 5, 0, 9, 0, 13, 0, 17, 0, 21, 0, 3, 0, 7, 0, 11, 0, 15, 0, 19, 0, 23

Offset: 1

Author

Gary W. Adamson, Sep 21 2007

Keywords

• nonn
• tabl

Comments

Row sums are the triangular numbers 1, 3, 6, 10, 15, 21, 28, ...; see A000217.

Examples

			From _Philippe Deléham_, Oct 28 2011: (Start)
Triangle begins:
  1;
  0,  3;
  1,  0,  5;
  0,  3,  0,  7;
  1,  0,  5,  0,  9;
  0,  3,  0,  7,  0, 11;
  1,  0,  5,  0,  9,  0, 13; ...
(End)
		

Crossrefs

Cf. A000217.

Formula

A128174 * A127775 as infinite lower triangular matrices. Triangle by columns: (2k-1, 0, 2k-1, 0, ...) in k-th column.

Extensions

Corrected and extended by Philippe Deléham, Oct 28 2011