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 A117812 #18 May 11 2023 17:52:13
%S A117812 0,0,15,728,65535,9765624,2176782335,678223072848,281474976710655,
%T A117812 150094635296999120,99999999999999999999,81402749386839761113320,
%U A117812 79496847203390844133441535,91733330193268616658399616008,123476695691247935826229781856255
%N A117812 a(n) = n^(2*n) - 1.
%C A117812 a(n) = A048861(n)*A014566(n) = A062206(n) - 1.
%t A117812 Join[{0},Table[(n^2)^n-1,{n,17}]] (* _Vladimir Joseph Stephan Orlovsky_, Feb 14 2011*)
%o A117812 (Magma)[n^(2*n) - 1: n in [0..40]]; // _Vincenzo Librandi_, Dec 26 2010
%Y A117812 Cf. A000312, A014566, A048861, A062206.
%K A117812 nonn
%O A117812 0,3
%A A117812 _Reinhard Zumkeller_, Oct 17 2006