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%I #5 Feb 20 2022 15:16:54
%S 1,3,2,4,4,3,5,5,5,4,6,6,6,6,5,7,7,7,7,7,6,8,8,8,8,8,8,7,9,9,9,9,9,9,
%T 9,8,10,10,10,10,10,10,10,10,9,11,11,11,11,11,11,11,11,11,10
%N Triangle, A127701 * A000012.
%C Row sums = A028387: (1, 5, 11, 19, 29, 41, 55, ...) A000012 * A127701 = A128219.
%F A127701 * A000012 as infinite lower triangular matrices. Triangle read by rows: a(1) = 1; n-th row = (n-1) terms of (n+1) followed by "n".
%e First few rows of the triangle:
%e 1;
%e 3, 2;
%e 4, 4, 3;
%e 5, 5, 5, 4;
%e 6, 6, 6, 6, 5;
%e 7, 7, 7, 7, 7, 6;
%e ...
%Y Cf. A128219, A000012, A127701, A028387.
%K nonn,tabl
%O 1,2
%A _Gary W. Adamson_, Feb 19 2007