%I #12 May 29 2023 13:00:15
%S 1,3,1,6,1,1,10,3,1,1,15,3,1,1,1,21,6,3,1,1,1,28,6,3,1,1,1,1,36,10,3,
%T 3,1,1,1,1,45,10,6,3,1,1,1,1,1,55,15,6,3,3,1,1,1,1,1,66,15,6,3,3,1,1,
%U 1,1,1,1,78,21,10,6,3,3,1,1,1,1,1,1,91,21,10,6,3,3,1,1,1,1,1,1,1
%N Triangle read by rows: A000012 * A126988 as infinite lower triangular matrices.
%C Row sums = A024916: (1, 4, 8, 15, 21, 33, ...).
%F By columns, k=1,2,3,...; k repeated terms of the triangular series, (1, 3, 6, 10, ...) in the k-th column.
%e First few rows of the triangle:
%e 1;
%e 3, 1;
%e 6, 1, 1;
%e 10, 3, 1, 1;
%e 15, 3, 1, 1, 1;
%e 21, 6, 3, 1, 1, 1;
%e 28, 6, 3, 1, 1, 1, 1;
%e 36, 10, 3, 3, 1, 1, 1, 1;
%e 45, 10, 6, 3, 1, 1, 1, 1, 1;
%e ...
%Y Cf. A000012, A000217, A024916, A126988.
%K nonn,tabl
%O 1,2
%A _Gary W. Adamson_, Mar 04 2007
%E a(11) = 1 inserted and more terms from _Georg Fischer_, May 29 2023