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 A152840 #8 Jun 03 2025 08:42:53
%S A152840 -1,0,4,-14197
%N A152840 a(0) = -1; a(n) = n^(n+a(n-1)) - a(n-1)^(n+a(n-1)).
%t A152840 lst={};a=1;Do[a=n^(n+a)-a^(n+a);AppendTo[lst,a],{n,0,3}];lst
%Y A152840 Cf. A084964, A152832, A152833, A152835, A152836, A152837, A152838, A152839
%K A152840 sign
%O A152840 0,3
%A A152840 _Vladimir Joseph Stephan Orlovsky_, Dec 14 2008
%E A152840 Indices added to definition, offset corrected - _R. J. Mathar_, Jan 08 2009
%E A152840 Definition corrected by _Georg Fischer_, Jun 03 2025