%I #6 Mar 27 2022 18:51:50
%S 1,1,2,1,1,2,1,2,1,3,1,1,1,2,1,2,2,2,1,4,1,1,1,1,1,1,2,1,2,2,2,1,4,1,
%T 1,1,1,1,1,2,1,2,1,3,1,2,1,4,1,1,2,1,1,2,1,1,3,1,2,1,2,2,2,1,2,1,4
%N Triangle read by rows, n-th row = first n terms of an array formed by A051731 * A051731(transform).
%C Row sums = sigma(n), A000203: (1, 3, 4, 7, 6, 12, 8, ...).
%C Right border = d(n), A000005: (1, 2, 2, 3, 2, 4, 2, 4, ...).
%F Given the transform A051731 * A051731(transform), extract the first n terms of each row to form the triangle.
%e First few rows of the array:
%e 1, 1, 1, 1, 1, 1, 1, ...
%e 1, 2, 1, 2, 1, 2, 1, ...
%e 1, 1, 2, 1, 1, 2, 1, ...
%e 1, 2, 1, 3, 1, 2, 1, ...
%e 1, 1, 1, 1, 2, 1, 1, ...
%e 1, 2, 2, 2, 1, 4, 1, ...
%e ...
%e First few rows of the triangle:
%e 1;
%e 1, 2;
%e 1, 1, 2;
%e 1, 2, 1, 3;
%e 1, 1, 1, 1, 2;
%e 1, 2, 2, 2, 1, 4;
%e 1, 1, 1, 1, 1, 1, 2;
%e 1, 2, 1, 3, 1, 2, 1, 4;
%e 1, 1, 2, 1, 1, 2, 1, 1, 3;
%e 1, 2, 1, 2, 2, 2, 1, 2, 1, 4;
%e ...
%Y Cf. A051731, A000203, A000005.
%K nonn,tabl
%O 1,3
%A _Gary W. Adamson_, Nov 12 2007