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 A144515 #2 Mar 30 2012 17:25:32 %S A144515 1,2,1,2,0,1,3,1,0,1,2,0,0,0,1,4,1,1,0,0,1,2,0,0,0,0,0,1,4,1,0,1,0,0, %T A144515 0,1,3,0,1,0,0,0,0,0,1,4,1,0,0,1,0,0,0,0,1 %N A144515 Triangle read by rows: A051731 * A103451. %C A144515 Row sums = A114003: (1, 3, 3, 5, 3, 7, 3, 7, 5, 7,...). %C A144515 Left border = d(n), A000005: (1, 2, 2, 3, 2, 4, 2, 4,...). %F A144515 A051731 * A103451 as infinite lower triangular matrices. Left border of A051731 (all 1's) is replaced with A000005: (1, 2, 2, 3, 2, 4,...). %e A144515 First few rows of the triangle are: %e A144515 1; %e A144515 2, 1; %e A144515 2, 0, 1; %e A144515 3, 1, 0, 1; %e A144515 2, 0, 0, 0, 1; %e A144515 4, 1, 1, 0, 0, 1; %e A144515 2, 0, 0, 0, 0, 0, 1; %e A144515 ... %Y A144515 Cf. A114003, A000005, A103451. %K A144515 nonn,tabl %O A144515 0,2 %A A144515 _Gary W. Adamson_, Nov 21 2007