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 A362187 #19 Apr 17 2023 02:02:28 %S A362187 1,1,2,720,479001600,2432902008176640000, %T A362187 265252859812191058636308480000000, %U A362187 1405006117752879898543142606244511569936384000000000,710998587804863451854045647463724949736497978881168458687447040000000000000 %N A362187 a(n) = (n^2 - n)!. %C A362187 The next term has 104 digits. %C A362187 For n > 0, a(n) is the number of n X n matrices using all the integers from 1 to n^2 and having the main diagonal given. %H A362187 Winston de Greef, <a href="/A362187/b362187.txt">Table of n, a(n) for n = 0..21</a> %F A362187 a(n) = (n^2 - n)*a(n-1) for n > 1. %F A362187 a(n) = A000142(A002378(n-1)) for n > 0. %t A362187 a[n_]:=(n^2-n)!; Array[a,9,0] %Y A362187 Cf. A000142, A000290, A002378, A088020. %Y A362187 Cf. A039622, A179268, A272094, A272095, A272164. %Y A362187 Cf. A362209. %K A362187 nonn,easy %O A362187 0,3 %A A362187 _Stefano Spezia_, Apr 10 2023