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 A049729 #4 Mar 30 2012 18:56:56 %S A049729 4,13,26,46,75,104,148,189,241,302,363,439,508,596,681,774,886,991, %T A049729 1107,1224,1344,1489,1622,1778,1919,2083,2248,2409,2605,2774,2970, %U A049729 3163,3356,3572,3785,4009,4246,4474,4719,4948,5220,5477 %N A049729 a(n)=T(n,n+1), array T as in A049723. %K A049729 nonn %O A049729 0,1 %A A049729 _Clark Kimberling_