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%I #8 Mar 04 2022 11:18:29
%S 1,5,4,12,5,7,22,6,8,10,35,7,9,11,13,51,8,10,12,14,16,70,9,11,13,15,
%T 17,19,92,10,12,14,16,18,20,22,117,11,13,15,17,19,21,23,25,145,12,14,
%U 16,18,20,22,24,26,28
%N Triangle, A000012 * A131844 as infinite lower triangular matrices.
%C Left column = pentagonal numbers, A000326: (1, 5, 12, 22, ...).
%C Row sums = A001106: (1, 9, 24, 46, 75, 111, ...).
%e First few rows of the triangle:
%e 1;
%e 5, 4;
%e 12, 5, 7;
%e 22, 6, 8, 10;
%e 35, 7, 9, 11, 13;
%e 51, 8, 10, 12, 14, 16;
%e 70, 9, 11, 13, 15, 17, 19;
%e 92, 10, 12, 14, 16, 18, 20, 22;
%e ...
%Y Cf. A131844, A001106, A000326.
%K nonn,tabl
%O 0,2
%A _Gary W. Adamson_, Jul 22 2007
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