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Search: id:A052272
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| A052272 |
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Number of n X n matrices over GF(5) under row and column permutations. |
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+0
9
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| 1, 5, 175, 57675, 270656150, 20834113243925, 28125393244553141210, 699686291478538604891895515, 333504381764054807093590006199733915, 3140944762272022074073055438393255181867210010
(list; graph; listen)
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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[...] = 5^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, A052271, A091062.
Sequence in context: A123111 A060070 A027873 this_sequence A111515 A157204 A141981
Adjacent sequences: A052269 A052270 A052271 this_sequence A052273 A052274 A052275
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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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