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A162544
Triangle giving number L(k,n) of isotopy classes of Latin rectangles.
1
1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 2, 3, 3, 2, 1, 4, 16, 56, 40, 22, 1, 4, 56, 1398, 6941, 3479, 564, 1, 7, 370, 93561, 4735238, 29163047, 13302311, 1676267, 1, 8, 2877, 8024046
OFFSET
1,8
COMMENTS
Isotopy class means an equivalence class of Latin rectangles under the operations of row permutation, column permutation and symbol permutation.
REFERENCES
B. D. Mckay, Isomorph-free exhaustive generation, Department of Computer Science Australian National University, Canberra, 1998.
CROSSREFS
Sequence in context: A373092 A222656 A162545 * A209323 A083647 A364332
KEYWORD
nonn,tabl,more
AUTHOR
Vladan Radivojevic (vladanradivojevic(AT)yahoo.com), Jul 05 2009
STATUS
approved