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 A053986 #27 Nov 11 2020 03:05:19
%S A053986 0,1,4,729,281474976710656,
%T A053986 752316384526264005099991383822237233803945956334136013765601092018187046051025390625
%N A053986 a(n) = n^(n!).
%C A053986 Next term has 561 digits.
%F A053986 Sum_{n>=1} 1/a(n) = A100084. - _Amiram Eldar_, Nov 11 2020
%e A053986 a(3) = 729 because 3^3! = 3^6 = 729.
%t A053986 Table[n^n!, {n, 0, 5}] (* _Alonso del Arte_, Jan 03 2011 *)
%o A053986 (Maxima) makelist(n^n!,n,0,6); /* _Martin Ettl_, Jan 13 2013 */
%Y A053986 Cf. A036740, A050923, A100084.
%K A053986 easy,nonn
%O A053986 0,3
%A A053986 _Henry Bottomley_, Apr 03 2000
%E A053986 One more term from _Lior Manor_, Nov 27 2001