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 A049733 #4 Mar 30 2012 18:56:56 %S A049733 9,13,15,26,39,54,71,96,119,148,177,212,249,290,331,378,427,484,539, %T A049733 596,657,724,793,866,939,1022,1099,1184,1267,1360,1453,1552,1653,1750, %U A049733 1863,1970,2079,2196,2311,2444,2565,2690,2821,2958 %N A049733 a(n)=T(n,2), array T as in A049723. %K A049733 nonn %O A049733 0,1 %A A049733 _Clark Kimberling_