Search: id:A052271
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%I A052271
%S A052271 1,4,76,8240,7880456,79846389608,9178323524804624,
%T A052271 12508419942924578958856,209493560585995285291677153144,
%U A052271 44407122853769773657258254744483639216
%N A052271 Number of n X n matrices over GF(4) under row and column permutations.
%F A052271 a(n) = sum {1*s_1+2*s_2+...=n, 1*t_1+2*t_2+...=n} (fix A[s_1, s_2, ...;
               t_1, t_2, ...]/(1^s_1*s_1!*2^s_2*s_2!*...*1^t_1*t_1!*2^t_2*t_2!*...)) 
               where fix A[...] = 4^sum {i, j>=1} (gcd(i, j)*s_i*t_j) - Christian 
               G. Bower (bowerc(AT)usa.net), Dec 18 2003
%Y A052271 Cf. A002724, A052269, A052272, A091061.
%Y A052271 Sequence in context: A012010 A012155 A118193 this_sequence A080989 A006267 
               A054951
%Y A052271 Adjacent sequences: A052268 A052269 A052270 this_sequence A052272 A052273 
               A052274
%K A052271 nonn
%O A052271 0,2
%A A052271 Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 05 2000

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