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 A127235 #3 Mar 31 2012 10:22:03
%S A127235 1,4,4320,11496038400,291948240981196800000,
%T A127235 190982059064777562218142105600000000,
%U A127235 7081230833474514688657438735472338312479375360000000000
%N A127235 a(n) = n! (2*sum(1..n-1))!.
%C A127235 Number of distinct n x n matrices containing n^2 different elements which have that same trace.
%t A127235 Table[n! (2*Sum[x, {x, 1, n - 1}])!, {n, 1, 10}]
%Y A127235 Cf. A127233, A127234.
%K A127235 nonn
%O A127235 1,2
%A A127235 _Artur Jasinski_, Jan 09 2007, Jan 11 2007