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 A136868 #2 Mar 31 2012 10:31:22 %S A136868 1,1,0,1,1,0,1,2,1,0,1,2,4,1,0,1,2,6,7,1,0,1,2,6,14,12,1,0,1,2,6,17 %N A136868 Table read by antidiagonals: T(n,k) is the number of connected directed multigraphs with loops with n arcs and k vertices, which are transitive (the existence of a path between two points implies the existence of an arc between those two points). %C A136868 Partial sums of the rows of A139624, i.e., T(n,k) = sum(T139624(n,p),p=0..k). %C A136868 T(0,k) = 1 for k>=0; T(n,0) = 0 and T(n,1) = 1 for n>0. %C A136868 If k>=n+1, T(n,k) = A139629(n). %e A136868 Triangle begins: %e A136868 1, %e A136868 1, 0, %e A136868 1, 1, 0, %e A136868 1, 2, 1, 0, %e A136868 1, 2, 4, 1, 0, %e A136868 1, 2, 6, 7, 1, 0, %e A136868 1, 2, 6,14,12, 1, 0, %Y A136868 Cf. A138352. %K A136868 more,nonn,tabl %O A136868 0,8 %A A136868 _Benoit Jubin_, May 11 2008