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 A171894 #3 Mar 30 2012 16:51:56 %S A171894 1,0,1,0,1,0,0,0,0,1,0,1,0,0,0,0,1,0,0,1,0,0,0,1,0,0,0,0,0,1,0,0,0,0, %T A171894 1,0,0,0,0,0,1,0,0,1,0,0,1,0,0,0,0,1,0,0,0,1,0,0,1,0,0,0,1,0,0,1,0,0, %U A171894 0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,1,0,0,0,0,1,0,0,1,0,0,0,0,0,1,0 %N A171894 1 if A181391(n) is a new value in A181391, otherwise 0. %H A171894 N. J. A. Sloane, <a href="/A171894/b171894.txt">Table of n, a(n) for n = 1..10000</a> %Y A171894 Cf. A181391, A171895. %K A171894 nonn %O A171894 1,1 %A A171894 _N. J. A. Sloane_, Oct 19 2010