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%I #18 Aug 10 2021 12:14:10
%S 1,1,6,13440,81729648000,4963587213865915514880,
%T 7973107998754741458076119859200000000,
%U 738615790595351500616546025309298211371540807680000000000
%N a(n) = (n^2)! / (n^n).
%H Seiichi Manyama, <a href="/A062782/b062782.txt">Table of n, a(n) for n = 0..21</a>
%F a(n) = A088020(n)/A000312(n). - _Seiichi Manyama_, Mar 26 2019
%t Join[{1},Table[(n^2)!/n^n,{n,8}]] (* _Harvey P. Dale_, Aug 10 2021 *)
%o (PARI) for(n=0, 8, print1((n^2)!/(n^n), ", "))
%Y Cf. A000312, A088020.
%K easy,nonn
%O 0,3
%A _Jason Earls_, Jul 18 2001
%E a(0)=1 prepended by _Seiichi Manyama_, Mar 26 2019
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