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%I #6 Mar 25 2022 00:33:24
%S 1,1,2,4,2,3,4,6,3,4,9,6,8,4,5,9,12,8,10,5,6,16,12,15,10,12,6,7,16,20,
%T 15,18,12,14,7,8,25,20,24,18,21,14,16,8,9,25,30,24,28,21,24,16,18,9,10
%N A002260 * A128174.
%C Row sums = A049778: (1, 3, 9, 17, 32, 50, 78, ...).
%F A002260 * A128174 as infinite lower triangular matrices.
%e First few rows of the triangle:
%e 1;
%e 1, 2;
%e 4, 2, 3;
%e 4, 6, 3, 4;
%e 9, 6, 8, 4, 5;
%e 9, 12, 8, 10, 5, 6;
%e 16, 12, 15, 10, 12, 6, 7;
%e ...
%Y Cf. A128174, A002260, A049778.
%K nonn,tabl
%O 1,3
%A _Gary W. Adamson_, Oct 25 2007
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