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 A152838 #4 Mar 31 2012 12:38:17
%S A152838 1,0,-1,-2,3,118,
%T A152838 -199068134034785153195409370979964879499768447341765846329146257207125965412281784631240438088
%N A152838 a(0)=1; a(n)=Floor[a(n-1)^n-n^a(n-1)].
%e A152838 a(1) = 1^1-1^1 = 0. - R. J. Mathar, Jan 08 2009
%t A152838 lst={};a=1;Do[a=a^n-n^a;AppendTo[lst,Floor[a]],{n,0,6}];lst
%Y A152838 Cf. A084964, A152832, A152833, A152835, A152836, A152837
%K A152838 sign
%O A152838 0,4
%A A152838 _Vladimir Joseph Stephan Orlovsky_, Dec 14 2008
%E A152838 Indices added to definition, offset corrected - _R. J. Mathar_, Jan 08 2009