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%I #4 Mar 05 2022 00:56:20
%S 1,3,3,6,5,6,10,8,9,10,15,12,13,14,15,21,17,18,19,20,21,28,23,24,25,
%T 26,27,28,36,30,31,32,33,34,35,36,45,38,39,40,41,42,43,44,45,55,47,48,
%U 49,50,51,52,53,54,55
%N A002260 + A000027 - A000012 as infinite lower triangular matrices.
%C Row sums = A132127: (1, 6, 17, 37, 69, 116, ...).
%e First few rows of the triangle:
%e 1;
%e 3, 3;
%e 6, 5, 6;
%e 10, 8, 9, 10;
%e 15, 12, 13, 14, 15;
%e 21, 17, 18, 19, 20, 21;
%e ...
%Y Cf. A002260, A000027, A000012, A132127.
%K nonn,tabl
%O 1,2
%A _Gary W. Adamson_, Aug 10 2007
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