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 A178650 #5 Dec 27 2023 01:02:12 %S A178650 1,2,1,2,0,1,3,1,1,1,2,0,1,0,1,4,1,2,0,1,1,2,0,1,0,1,0,1,4,1,2,1,1,0, %T A178650 1,1,3,0,2,0,1,0,1,0,1,4,1,2,0,2,0,1,0,1,1,2,0,1,0,1,0,1,0,1,0,1,6,1, %U A178650 4,1,2,1,1,0,1,0,1,1 %N A178650 Triangle read by rows A051731 * A070909. %C A178650 Row sums = A069734: (1, 3, 3, 6, 4, 9, 5, 11,...) %C A178650 Left border = d(n), A000005 %F A178650 As infinite lower triangular matrices, A051731 * A070909; where A051731 = the inverse Mobius transform. %e A178650 First few rows of the triangle = %e A178650 1; %e A178650 2, 1; %e A178650 2, 0, 1; %e A178650 3, 1, 1, 1; %e A178650 2, 0, 1, 0, 1; %e A178650 4, 1, 2, 0, 1, 1; %e A178650 2, 0, 1, 0, 1, 0, 1; %e A178650 4, 1, 2, 1, 1, 0, 1, 1; %e A178650 3, 0, 2, 0, 1, 0, 1, 0, 1; %e A178650 4, 1, 2, 0, 2, 0, 1, 0, 1, 1; %e A178650 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1; %e A178650 6, 1, 4, 1, 2, 1, 1, 0, 1, 0, 1, 1; %e A178650 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1; %e A178650 4, 1, 2, 0, 2, 0, 2, 0, 1, 0, 1, 0, 1, 1; %e A178650 4, 0, 3, 0, 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 %e A178650 5, 1, 3, 1, 2, 0, 2, 1, 1, 0, 1, 0, 1, 0, 1, 1; %e A178650 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1; %e A178650 ... %Y A178650 Cf. A051731, A070909, A069734. %K A178650 nonn,tabf %O A178650 1,2 %A A178650 _Gary W. Adamson_, May 31 2010