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%I #5 Feb 08 2022 19:37:07
%S 1,1,2,1,6,2,1,12,12,2,1,20,40,20,2,1,30,100,100,30,2,1,42,210,350,
%T 210,42,2,1,56,392,980,980,392,56,2,1,72,672,2352,3528,2352,672,72,2,
%U 1,90,1080,5040,10584,10584,5040,1080,90,2
%N A001263 * A136521 as infinite lower triangular matrices, where A001263 = the Narayana triangle and A136521 = an infinite lower triangular matrix with (1, 2, 2, 2, ...) in the main diagonal and the rest zeros.
%C Row sums = A131428 starting (1, 3, 9, 27, 83, 263, ...).
%e First few rows of the triangle:
%e 1;
%e 1, 2;
%e 1, 6, 2;
%e 1, 12, 12, 2;
%e 1, 20, 40, 20, 2;
%e 1, 30, 100, 100, 30, 2;
%e 1, 42, 210, 350, 210, 42, 2;
%e ...
%Y Cf. A001263, A136521.
%K nonn,tabl
%O 1,3
%A _Gary W. Adamson_, Jan 02 2008
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