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 A031300 #4 Mar 30 2012 18:56:21 %S A031300 1,11,12,13,15,17,19,21,23,25,27,29,32,52,72,92,112,132,152,172,192, %T A031300 193,195,198,201,204,207,210,213,216,219,221,222,223,224,225,227,228, %U A031300 230,231,233,234,236,237,239,240,242,243,245,246 %N A031300 Position of n-th 1 in A031298. %K A031300 nonn %O A031300 1,2 %A A031300 _Clark Kimberling_