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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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11
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1, 4, 76, 8240, 7880456, 79846389608, 9178323524804624, 12508419942924578958856, 209493560585995285291677153144, 44407122853769773657258254744483639216, 122042291850117110186411151373496788803833567344, 4435666701292795500500326090033525002278314431436080593856
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OFFSET
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0,2
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LINKS
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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} (fixA[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 fixA[...] = 4^sum_{i, j>=1} (gcd(i,j)*s_i*t_j). - Christian G. Bower, Dec 18 2003
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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