

A000479


Number of 1factorizations of K_{n,n}.


9



1, 1, 1, 2, 24, 1344, 1128960, 12198297600, 2697818265354240, 15224734061278915461120, 2750892211809148994633229926400, 19464657391668924966616671344752852992000
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OFFSET

0,4


COMMENTS

Also, number of Latin squares of order n with first row 1,2,...,n.
Also number of fixed diagonal Latin squares of order n.  Eric W. Weisstein, Dec 18 2005
Also maximum number of Latin squares of order n such that no two of them have all the same rows (respectively, columns).  Rick L. Shepherd, Mar 01 2008


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=0..11.
B. D. McKay, A. Meynert and W. Myrvold, Small Latin Squares, Quasigroups and Loops, J. Combin. Designs 15 (2007), no. 2, 98119.
B. D. McKay and I. M. Wanless, On the number of Latin squares, Ann. Combinat. 9 (2005) 335344.
Artur Schaefer, Endomorphisms of The Hamming Graph and Related Graphs, arXiv preprint arXiv:1602.02186, 2016.
D. S. Stones, The many formulas for the number of Latin rectangles, Electron. J. Combin 17 (2010), A1.
D. S. Stones and I. M. Wanless, Divisors of the number of Latin rectangles, J. Combin. Theory Ser. A 117 (2010), 204215.
E. I. Vatutin, V. S. Titov, O. S. Zaikin, S. E. Kochemazov, S. U. Valyaev, A. D. Zhuravlev, M. O. Manzuk, Using grid systems for enumerating combinatorial objects with example of diagonal Latin squares, Information technologies and mathematical modeling of systems (2016), pp. 154157. (in Russian)
Vatutin E.I., Zaikin O.S., Zhuravlev A.D., Manzyuk M.O., Kochemazov S.E., Titov V.S., Using grid systems for enumerating combinatorial objects on example of diagonal Latin squares. CEUR Workshop proceedings. Selected Papers of the 7th International Conference Distributed Computing and Gridtechnologies in Science and Education. 2017. Vol. 1787. pp. 486490. urn:nbn:de:007417875.
Eric Weisstein's World of Mathematics, Latin Square
Index entries for sequences related to Latin squares and rectangles


FORMULA

a(n) = A000315(n)*(n1)! = A002860(n)/n!.


CROSSREFS

Cf. A000315, A000528, A002860.
See A040082 and A264603 for other versions.
Sequence in context: A232310 A028365 A094050 * A181231 A111427 A081955
Adjacent sequences: A000476 A000477 A000478 * A000480 A000481 A000482


KEYWORD

nonn,hard,nice


AUTHOR

N. J. A. Sloane


EXTENSIONS

One more term (from the McKayWanless article) from Richard Bean (rwb(AT)eskimo.com), Feb 17 2004


STATUS

approved



