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 A030345 #4 Mar 30 2012 18:56:18 %S A030345 1,2,8,4,1,2,7,12,41,18,8,17,4,5,1,6,11,14,2,48,7,30,10,13,39,12,176, %T A030345 73,41,80,23,18,92,8,45,72,17,31,84,25,4,96,5,54,76,1,58,6,29,36,100, %U A030345 38,11,68,14,185,21,2,50,48,149,59,40,89,7,30 %N A030345 a(n)=least k such that base 3 representation of n begins at s(k), where s=A030341. %K A030345 nonn %O A030345 1,2 %A A030345 _Clark Kimberling_