%I
%S 1,3,4,3,7,9,3,7,13,16,3,7,13,21,25,3,7,13,21,31,36,3,7,13,21,31,43,
%T 49,3,7,13,21,31,43,57,64,3,7,13,21,31,43,57,73,81,3,7,13,21,31,43,57,
%U 73,91,100
%N A002260 * A127701.
%C Deleting the right border (1, 4, 9, 16,...), rows tend to A002061 starting (3, 7, 13, 21, 31,...). Row sums = A108766: (1, 7, 19, 39, 69, 111,...)
%F A002260 * A127701 as infinite lower triangular matrices.
%e First few rows of the triangle are:
%e 1;
%e 3, 4;
%e 3, 7, 9;
%e 3, 7, 13, 16;
%e 3, 7, 13, 21, 25;
%e ...
%Y Cf. A002260, A127701, A108766, A002061.
%K nonn,tabl
%O 1,2
%A _Gary W. Adamson_, Jan 27 2007
