A128514 - OEIS

%I #9 Jan 25 2020 01:38:49

%S 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,

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

%U 70,29,12,5,2,1

%N Triangle, Pell sequence in every column.

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

%C Riordan array (1/(1-2x-x^2), x). - _Philippe Deléham_, Apr 23 2009

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

%e First few rows of the triangle:

%e    1;

%e    2,  1;

%e    5,  2,  1;

%e   12,  5,  2,  1;

%e   29, 12,  5,  2,  1;

%e   70, 29, 12,  5,  2,  1;

%e   ...

%Y Cf. A000129, A048739.

%K nonn,tabl

%O 1,2

%A _Gary W. Adamson_, Mar 05 2007