A128514 Triangle, Pell sequence in every column.

1, 2, 1, 5, 2, 1, 12, 5, 2, 1, 29, 12, 5, 2, 1, 70, 29, 12, 5, 2, 1, 169, 70, 29, 12, 5, 2, 1, 408, 169, 70, 29, 12, 5, 2, 1, 985, 408, 169, 70, 29, 12, 5, 2, 1, 2378, 985, 408, 169, 70, 29, 12, 5, 2, 1

Offset

1,2

Comments

Row sums = A048739 starting (1, 3, 8, 20, 49, 119, ...).

Riordan array (1/(1-2x-x^2), x). - Philippe Deléham, Apr 23 2009

Links

Table of n, a(n) for n=1..55.

Formula

A000129 in every column: (1, 2, 5, 12, 29, ...).

Example

First few rows of the triangle:
   1;
   2,  1;
   5,  2,  1;
  12,  5,  2,  1;
  29, 12,  5,  2,  1;
  70, 29, 12,  5,  2,  1;
  ...

Crossrefs

Cf. A000129, A048739.

Sequence in context: A375100 A126125 A221876 * A323953 A126075 A134032

Adjacent sequences: A128511 A128512 A128513 * A128515 A128516 A128517

Keyword

nonn,tabl

Author

Gary W. Adamson, Mar 05 2007

Status

approved