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%I #6 Mar 05 2022 01:47:35
%S 1,4,3,5,2,5,8,1,2,7,9,2,1,2,9,12,1,2,1,2,11,13,2,1,2,1,2,13,16,1,2,1,
%T 2,1,2,15,17,2,1,2,1,2,1,2,17,20,1,2,1,2,1,2,1,2,19
%N 2*A131821 - A128174.
%C Left column, congruent to {0, 1} mod 4, A042948: (1, 4, 5, 8, 9, 12, 13, 16, ...).
%C Row sums = A131912: (1, 7, 12, 18, 23, 29, 34, ...).
%F 2*A131821 - A128174 as infinite lower triangular matrices.
%e First few rows of the triangle:
%e 1;
%e 4, 3;
%e 5, 2, 5;
%e 8, 1, 2, 7;
%e 9, 2, 1, 2, 9;
%e 12, 1, 2, 1, 2, 11;
%e 13, 2, 1, 2, 1, 2, 13;
%e ...
%Y Cf. A131821, A128174, A042948, A131912.
%K nonn,tabl
%O 1,2
%A _Gary W. Adamson_, Jul 27 2007
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