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Search: id:A052271
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| A052271 |
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Number of n X n matrices over GF(4) under row and column permutations. |
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9
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| 1, 4, 76, 8240, 7880456, 79846389608, 9178323524804624, 12508419942924578958856, 209493560585995285291677153144, 44407122853769773657258254744483639216
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OFFSET
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0,2
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FORMULA
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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
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CROSSREFS
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Cf. A002724, A052269, A052272, A091061.
Sequence in context: A012010 A012155 A118193 this_sequence A080989 A006267 A054951
Adjacent sequences: A052268 A052269 A052270 this_sequence A052272 A052273 A052274
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KEYWORD
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nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 05 2000
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