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 A168311 #2 Mar 30 2012 18:49:10 %S A168311 33,41,53,54,63,75,86,96,104,117,118,125,129,162,167,179,180,185,188, %T A168311 195,204,222,223,224,229,230,243,248,251,261,270,271,284,285,293,294, %U A168311 314,317,318,333,334,338,339,348,349,350,360,365,369,375,376,377,383 %N A168311 Numbers that are not sums of two triangular numbers and are not one greater than a sum of two triangular numbers. %C A168311 Number n belongs to this sequence if both n and n-1 belong to A020757. %Y A168311 A020757 %K A168311 nonn %O A168311 1,1 %A A168311 _Tanya Khovanova_, Nov 22 2009