A143808 Triangle read by rows, first n terms of the sequence (1, 2, 4, 10, ...) followed by P(n), where (2, 4, 10, 12, ...) = twice Pell numbers.

1, 1, 1, 1, 2, 2, 1, 2, 4, 5, 1, 2, 4, 10, 12, 1, 2, 4, 10, 24, 29, 1, 2, 4, 10, 24, 58, 70, 1, 2, 4, 10, 24, 58, 140, 169, 1, 2, 4, 10, 24, 58, 140, 338, 408, 1, 2, 4, 10, 24, 58, 140, 338, 816, 985

Offset: 0

Author

Gary W. Adamson, Sep 01 2008

Keywords

• nonn
• tabl

Comments

Row sums = A000129(n), the Pell numbers: (1, 2, 5, 12, ...).

Examples

			First few rows of the triangle:
  1;
  1, 1;
  1, 2, 2;
  1, 2, 4, 5;
  1, 2, 4, 10, 12;
  1, 2, 4, 10, 24, 29;
  1, 2, 4, 10, 24, 58, 70;
  1, 2, 4, 10, 24, 58, 140, 169;
		

Crossrefs

Cf. A000129.