A078354 - OEIS

%I #7 Sep 08 2022 08:45:08

%S 1,20,160000,512000000000,655360000000000000000,

%T 335544320000000000000000000000000,

%U 68719476736000000000000000000000000000000000000

%N Number of n X n matrices over an alphabet of size 20.

%C a(n) = k^(n^2) with k = 2, 3, 4, ... counts n X n matrices over an alphabet of size k.

%H Vincenzo Librandi, <a href="/A078354/b078354.txt">Table of n, a(n) for n = 0..25</a>

%F a(n) = 20^(n^2).

%t Table[20^(n^2), {n, 0, 7}]

%o (Magma) [20^(n^2): n in [0..10]]; // _Vincenzo Librandi_, Jun 05 2011

%Y Cf. A078353, A002416.

%K nonn

%O 0,2

%A Vincenzo Origlio (vincenzo.origlio(AT)itc.cnr.it), Nov 25 2002