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 A152837 #4 Mar 31 2012 12:38:17
%S A152837 -1,2,0,1,3,-118,-2699554153024,
%T A152837 1044826807337428519663920677057429215016680080584103502827667086054551857192770337767423
%N A152837 a(0)=-1; a(n)=Floor[n^a(n-1)-a(n-1)^n].
%e A152837 a(1) = 1^(-1)-(-1)^1 = 2. - R. J. Mathar, Jan 08 2009
%t A152837 lst={};a=1;Do[a=n^a-a^n;AppendTo[lst,Floor[a]],{n,0,7}];lst
%Y A152837 Cf. A084964, A152832, A152833, A152835, A152836
%K A152837 sign
%O A152837 0,2
%A A152837 _Vladimir Joseph Stephan Orlovsky_, Dec 14 2008
%E A152837 Indices added to definition, offset corrected - _R. J. Mathar_, Jan 08 2009