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A052269
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Number of n X n matrices over GF(3) under row and column permutations.
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3
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1, 3, 27, 738, 90492, 64796982, 302752867740, 9610448114487414, 2130536585704570302966, 3379836486315342147630795474, 39197947672609240635681299333726499
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| 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[...] = 3^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
| Cf. A002724, A052271, A052272, A091060.
Sequence in context: A038379 A047656 A193610 * A138525 A185149 A194500
Adjacent sequences: A052266 A052267 A052268 * A052270 A052271 A052272
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KEYWORD
| nonn
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 04 2000
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