A266168 Number of isotopism classes of ordered pairs of orthogonal Latin squares.

1, 0, 1, 1, 3, 0, 34, 45927, 2203310919

Offset: 1

Author

Ian Wanless, Dec 22 2015

Keywords

• nonn
• more

Comments

The following operations produce things that are counted as equivalent: simultaneous permutation of the rows or columns of both squares; permutation of the symbols within either square.

Links

• J. Egan and I. M. Wanless, Enumeration of MOLS of small order, Mathematics of Computation 85, 2016, 799-824.
• Ian Wanless, Data on MOLS

Crossrefs

Cf. A129732, A266166, A266167.