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

0,5

Comments

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

Links

Table of n, a(n) for n=0..54.

Example

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.

Sequence in context: A035364 A261734 A209308 * A294600 A247495 A230290

Adjacent sequences: A143805 A143806 A143807 * A143809 A143810 A143811

Keyword

nonn,tabl

Author

Gary W. Adamson, Sep 01 2008

Status

approved