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 A186299 #7 Mar 31 2012 10:25:40 %S A186299 2,6,14,18,26,30,50,54,74,78,86,90,98,114,134,138,146,158,174,186,194, %T A186299 198,210,230,254,270,278,306,326,330,338,350,354,366,378,386,398,410, %U A186299 414,426,438,470,498,506,510,530,534,546,554,558,590,606 %N A186299 (A007521(n)-1)/2. %F A186299 a(n) = A186300(n)-1. %K A186299 nonn %O A186299 1,1 %A A186299 _Marco Matosic_, Feb 17 2011