A162544 Triangle giving number L(k,n) of isotopy classes of Latin rectangles.

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

Author

Vladan Radivojevic (vladanradivojevic(AT)yahoo.com), Jul 05 2009

Keywords

• nonn
• tabl
• more

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

Cf. A001009, A040082.