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 A000528 Number of types of Latin squares of order n. Equivalently, number of nonisomorphic 1-factorizations of K_{n,n}. 2
 1, 1, 1, 2, 2, 17, 324, 842227, 57810418543, 104452188344901572, 6108088657705958932053657 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Here "type" means an equivalence class of Latin squares under the operations of row permutation, column permutation, symbol permutation and transpose. In the 1-factorizations formulation, these operations are labeling of left side, labeling of right side, permuting the order in which the factors are listed and swapping the left and right sides, respectively. - Brendan McKay There are 6108088657705958932053657 isomorphism classes of one-factorizations of K_{11,11}. - Petteri Kaski (petteri.kaski(AT)cs.helsinki.fi), Sep 18 2009 REFERENCES CRC Handbook of Combinatorial Designs, 1996, p. 660. Denes and Keedwell, Latin Squares and Applications, Academic Press 1974. LINKS A. Hulpke, Petteri Kaski and Patric R. J. Östergård, The number of Latin squares of order 11, Math. Comp. 80 (2011) 1197-1219 B. D. McKay, A. Meynert and W. Myrvold, Small Latin Squares, Quasigroups and Loops, J. Combin. Designs, to appear (2005). CROSSREFS See A040082 for another version. Cf. A002860, A003090, A000315, A040082, A000479. Sequence in context: A238289 A206095 A222451 * A260478 A074970 A297794 Adjacent sequences: A000525 A000526 A000527 * A000529 A000530 A000531 KEYWORD hard,nonn,nice,more AUTHOR EXTENSIONS More terms from Richard Bean, Feb 17 2004 a(11) from Petteri Kaski (petteri.kaski(AT)cs.helsinki.fi), Sep 18 2009 STATUS approved

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Last modified April 2 02:53 EDT 2023. Contains 361723 sequences. (Running on oeis4.)