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 A031335 #4 Mar 30 2012 18:56:23 %S A031335 1,2,3,11,4,25,23,5,15,26,55,1,6,16,31,42,52,40,78,98,8,93,2,118,35, %T A031335 106,132,57,94,113,77,7,20,10,3,64,22,307,75,100,39,18,196,17,11,50, %U A031335 395,244,138,68,46,117,297,345,12,368,60,4,32,375 %N A031335 a(n)=least k such that n begins at s(k), where s=A031324. %K A031335 nonn %O A031335 1,2 %A A031335 _Clark Kimberling_