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 A255171 #6 Feb 17 2015 00:23:45 %S A255171 3,4,4,6,6,2,8,4,4,6,4,8,4,2,12,2,10,6,6,6,6,2,18,-2,6,10,8,6,6,-2,14, %T A255171 0,18,2,8,8,4,10,6,6,10,0,12,2,14,0,0,14,18,12,6,6,6,2,6,0,20,0,8 %N A255171 First differences of A072473. %H A255171 Zak Seidov, <a href="/A255171/b255171.txt">Table of n, a(n) for n = 1..1000</a> %F A255171 a(n) = A072473(n+1) - A072473(n). %Y A255171 Cf. A072473, A072715. %K A255171 sign %O A255171 1,1 %A A255171 _Zak Seidov_, Feb 15 2015