This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A141846 #2 Mar 30 2012 17:25:28 %S A141846 0,0,1,0,0,1,0,1,0,2,0,0,0,0,1,0,1,1,0,0,4,0,0,0,0,0,0,1,0,1,0,2,0,0, %T A141846 0,4,0,0,1,0,0,0,0,0,3,0,1,0,0,1,0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,1,0,1, %U A141846 1,2,0,4,0,0,0,0,0,8,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,1,0,0,0,0,0,0,8 %N A141846 Triangle read by rows: A051731 * A051953^(n-k) * 0^(n-k), 1 <= k <= n. %C A141846 Row sums = A001065: (0, 1, 1, 3, 1, 6, 1, 7, 4, 8,...). %C A141846 n-th row = (p-1) zeros followed by 1, iff n is prime. %C A141846 For T(n,k), k divides n if k not = 0. %F A141846 Triangle read by rows, A051731 * A051953^(n-k); where A051953^(n-k) = an infinite lower triangular matrix with A051953 (0, 1, 1, 2, 1, 4, 1, 4, 3, 6, 1, 8,...) in the main diagonal and the rest zeros. A051731 = inverse Mobius transform. %e A141846 First few rows of the triangle = %e A141846 0; %e A141846 0, 1; %e A141846 0, 0, 1; %e A141846 0, 1, 0, 2; %e A141846 0, 0, 0, 0, 1; %e A141846 0, 1, 1, 0, 0, 4; %e A141846 0, 0, 0, 0, 0, 0, 1; %e A141846 0, 1, 0, 2, 0, 0, 0, 4; %e A141846 0, 0, 1, 0, 0, 0, 0, 0, 3; %e A141846 0, 1, 0, 0, 1, 0, 0, 0, 0, 6; %e A141846 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1; %e A141846 0, 1, 1, 2, 0, 4, 0, 0, 0, 0, 0, 8; %e A141846 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1; %e A141846 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 8; %e A141846 ... %Y A141846 Cf. A051953, A001065. %K A141846 nonn,tabl %O A141846 1,10 %A A141846 _Gary W. Adamson_, Jul 11 2008