%I A053293
%S A053293 1,6,2016,33784128,27811094169600,1122211189922928537600,
%T A053293 2218959336124989671614429593600,
%U A053293 214992513152176999576908105619651923148800
%N A053293 Number of nonsingular n X n matrices over GF(7).
%H A053293 J. Overbey, W. Traves and J. Wojdylo, <a href="http://jeff.over.bz/papers/
               undergrad/on-the-keyspace-of-the-hill-cipher.pdf">On the Keyspace 
               of the Hill Cipher</a>
%F A053293 (7^n - 1)(7^n - 7)...(7^n - 7^(n-1))
%Y A053293 Cf. A002884, A053290-A053292.
%Y A053293 Cf. A003790.
%Y A053293 Sequence in context: A160301 A024086 A094036 this_sequence A004817 A089535 
               A059081
%Y A053293 Adjacent sequences: A053290 A053291 A053292 this_sequence A053294 A053295 
               A053296
%K A053293 nonn,easy
%O A053293 0,2
%A A053293 Stephen G. Penrice (spenrice(AT)ets.org), Mar 04 2000
%E A053293 More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 16 2000