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 A057989 #3 Mar 30 2012 18:57:04 %S A057989 2,10,12,15,19,24,28,32,40,44,48,53,55,63,65,68,72,76,81,83,91,95,103, %T A057989 105,108,112,117,121,125,130,132,140,144,152,154,157,161,165,173,175, %U A057989 178,182,187,191,195,203,207,211,216,218,226,230 %N A057989 Positions of 00 or 11 or 22 in A057985. %K A057989 nonn %O A057989 1,1 %A A057989 _Clark Kimberling_, Oct 30 2000