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 A120840 #16 Sep 08 2022 08:45:26
%S A120840 0,2,544,1933442,152544843904,298022376588343682,
%T A120840 14551915078272216509641504,17763568393763205317547489159863042,
%U A120840 542101086242748783319906107922486197863801344
%N A120840 5^(n^2)-3^(n^2).
%H A120840 Vincenzo Librandi, <a href="/A120840/b120840.txt">Table of n, a(n) for n = 0..30</a>
%F A120840 a(n) = A060758(n)-A060722(n)=A095860(5,n)-A095860(3,n). - _R. J. Mathar_, Apr 24 2007
%t A120840 Table[5^(n^2) - 3^n^2, {n, 0, 10}] (* _Vincenzo Librandi_, Feb 27 2013 *)
%o A120840 (Magma) [5^(n^2) - 3^(n^2): n in [0..10]]; // _Vincenzo Librandi_, Feb 27 2013
%o A120840 (PARI) a(n)=5^(n^2)-3^(n^2) \\ _Charles R Greathouse IV_, Feb 27 2013
%Y A120840 Cf. A007689, A001047.
%K A120840 nonn,easy
%O A120840 0,2
%A A120840 _Mohammad K. Azarian_, Aug 18 2006
%E A120840 Corrected by _Ray Chandler_, Sep 06 2006