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 A140703 #2 Mar 30 2012 17:25:28 %S A140703 1,4,1,7,1,1,13,4,1,1,16,4,1,1,1,25,7,4,1,1,1,28,7,4,1,1,1,1,38,13,4, %T A140703 4,1,1,1,1,44,13,7,4,1,1,1,1,1,53,16,7,4,4,1,1,1,1,1,56,16,7,4,4,1,1, %U A140703 1,1,1,1 %N A140703 A000012 * A051731^3. %C A140703 Row sums = A061202: (1, 5, 9, 19, 23, 39,...). %C A140703 Leftmost column = A061201: (1, 4, 7, 13, 16, 25, 28,...). %F A140703 A000012 * A051731^3 as infinite lower triangular matrices, where A000012 = [1; 1,1; 1,1,1;...] and A051731 = the inverse Mobius transform. %e A140703 First few rows of the triangle are: %e A140703 1; %e A140703 4, 1; %e A140703 7, 1, 1; %e A140703 13, 4, 1, 1; %e A140703 16, 4, 1, 1, 1; %e A140703 25, 7, 4, 1, 1, 1; %e A140703 28, 7, 4, 1, 1, 1, 1; %e A140703 38, 13, 4, 4, 1, 1, 1, 1; %e A140703 ... %Y A140703 Cf. A051731, A061202, A061201. %K A140703 nonn,tabl %O A140703 1,2 %A A140703 _Gary W. Adamson_, May 24 2008