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 A177828 #2 Mar 30 2012 17:26:35 %S A177828 3,2,6,4,20,10,20,6,24,6,34,26,4,26,40,44,4,12,14,6,4,30,26,16,32,18, %T A177828 22,2,24,12,4,44,24,6,16,14,6,48,16,14,10,38,4,26,18,34,2,4,2,24,30, %U A177828 70,14,16,14,34,56,22,8,6,58,50,6,84,46,56,16,8,12,52,12,20,70,8,6,10,32,54 %N A177828 First differences of A176983. %C A177828 a(n)=2 for n=2,28,47,49,135,173,225,258,375,384,439, A177829. %Y A177828 Cf. A176983, A177829. %K A177828 nonn %O A177828 1,1 %A A177828 _Zak Seidov_, May 14 2010