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 A116862 #2 Mar 31 2012 13:20:11 %S A116862 1,7,55,472,4300,40861,400567,4021720,41147398,427470430,4497253054, %T A116862 47817544348,513029453530,5547155801065,60385754935495, %U A116862 661267785740080,7279524885630310,80512572260496610,894231158402339410 %N A116862 Row sums of triangle A116868 (called Y(1,3)). %F A116862 a(n)=sum(A116868(n,m),m=1..n+1), n>=0. %K A116862 nonn,easy %O A116862 0,2 %A A116862 _Wolfdieter Lang_, Mar 24 2006