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 A127223 #9 Jul 27 2025 00:21:56
%S A127223 1,1,12,60480,871782912000,129260083694424883200000,
%T A127223 516657398319307246483332566876160000000,
%U A127223 120690846038545150966716699071685590652292228448256000000000
%N A127223 a(n) = (n^2)!/n!.
%H A127223 Amiram Eldar, <a href="/A127223/b127223.txt">Table of n, a(n) for n = 0..21</a>
%t A127223 Table[(n^2)!/(n!), {n, 0, 10}]
%Y A127223 Cf. A127224, A127225.
%K A127223 nonn
%O A127223 0,3
%A A127223 _Artur Jasinski_, Jan 09 2007
%E A127223 a(0) = 1 prepended by _Peter Luschny_, May 20 2019