A266169 Number of trisotopism classes of unordered pairs of orthogonal Latin squares.

1, 0, 1, 1, 2, 0, 14, 11887, 550907773

Offset

1,5

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; interchanging the squares; transposing both squares.

Links

Table of n, a(n) for n=1..9.

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. A266166, A266167, A266168.

Sequence in context: A229091 A369243 A189425 * A277928 A232423 A074031

Adjacent sequences: A266166 A266167 A266168 * A266170 A266171 A266172

Keyword

nonn,more

Author

Ian Wanless, Dec 22 2015

Status

approved