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 A170836 #3 May 01 2013 21:02:10 %S A170836 0,1,4,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16, %T A170836 16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16, %U A170836 16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16 %N A170836 First differences of A170837. %F A170836 a(n)=16 for n >= 3. %K A170836 nonn %O A170836 0,3 %A A170836 _N. J. A. Sloane_, Jan 05 2010, based on email from _R. J. Mathar_, Jun 02 2009