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 A135476 #2 Mar 30 2012 17:26:26 %S A135476 1,2,5,6,11,20,20,27,32,32,35,36,47,71,72,95,116,135,140,152,167,180, %T A135476 191,200,207,207,207,212,215,216,272,335,380,396,455,512,551,567,620, %U A135476 671,720,720,767,812,855,887,896,935,972,1007,1040,1052,1071,1100,1127 %N A135476 Positive numbers of the form 6^x-y^2 with repetition. %Y A135476 Cf. A051217, A134989. %K A135476 nonn %O A135476 1,2 %A A135476 _Zak Seidov_, Feb 06 2008