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 A031000 #4 Mar 30 2012 18:56:19 %S A031000 1,7,9,10,11,13,15,17,19,24,38,52,66,80,91,94,96,97,100,103,106,109, %T A031000 112,113,115,116,117,118,119,121,122,124,125,127,128,130,131,133,136, %U A031000 138,139,142,145,148,151,154,157,159,160,163,166 %N A031000 Position of n-th 1 in A030998. %K A031000 nonn %O A031000 1,2 %A A031000 _Clark Kimberling_