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 A051057 #3 Mar 30 2012 18:37:41 %S A051057 0,0,0,0,1,1,2,3,6,9,16,23,36,52,78,111,163,227,322,444,618,841,1151, %T A051057 1550,2094,2793,3730,4931,6522,8555,11216,14608 %N A051057 Record subsequence of b(3k+1), b()=A048142(). %K A051057 nonn %O A051057 0,7 %A A051057 _Wouter Meeussen_