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%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