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%I #10 Mar 01 2023 14:05:56
%S 1,18,104976,198359290368,121439531096594251776,
%T 24088659210943104643915283693568,
%U 1548139828427760582529495524831238344488779776
%N Number of n X n matrices over an alphabet of size 18.
%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="/A078352/b078352.txt">Table of n, a(n) for n = 0..25</a>
%F a(n) = 18^(n^2).
%t Table[18^(n^2), {n, 0, 7}]
%t 18^(Range[0, 10]^2) (* _Wesley Ivan Hurt_, Mar 01 2023 *)
%o (Magma) [18^(n^2): n in [0..10]]; // _Vincenzo Librandi_, Jun 05 2011
%Y Cf. A078351.
%K nonn
%O 0,2
%A Vincenzo Origlio (vincenzo.origlio(AT)itc.cnr.it), Nov 25 2002
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