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 A127568 #7 Sep 08 2013 18:30:35 %S A127568 1,1,1,1,1,2,1,1,2,5,1,1,2,5,15,1,1,2,5,15,52,1,1,2,5,15,52,203 %N A127568 Triangle T(n,k) = Bell(k) = A000110(k), 0<=k<=n. %e A127568 First few rows of the triangle are: %e A127568 1; %e A127568 1, 1; %e A127568 1, 1, 2; %e A127568 1, 1, 2, 5; %e A127568 1, 1, 2, 5, 15; %e A127568 1, 1, 2, 5, 15, 52; %e A127568 ... %Y A127568 Cf. A005001 (row sums), A000110. %K A127568 nonn,tabl %O A127568 0,6 %A A127568 _Gary W. Adamson_, Jan 19 2007