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 A049718 #4 Mar 30 2012 18:56:56 %S A049718 6,13,22,33,50,69,90,117,142,175,208,247,290,329,380,427,482,539,592, %T A049718 663,726,797,866,937,1022,1101,1188,1275,1362,1461,1554,1661,1762, %U A049718 1871,1978,2083,2206,2325,2450,2571,2698,2833,2966 %N A049718 a(n)=T(n,n+2), array T as in A048149. %K A049718 nonn %O A049718 0,1 %A A049718 _Clark Kimberling_