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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

Table of n, a(n) for n=1..11.

A. Hulpke, P. Kaski and P. R. J. Ostergard, 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).

Index entries for sequences related to Latin squares and rectangles

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

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Richard Bean (rwb(AT)eskimo.com), Feb 17 2004

STATUS

approved

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Last modified January 18 01:36 EST 2019. Contains 319260 sequences. (Running on oeis4.)