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.
This sequence is also the number of trisotopism classes of *ordered* pairs of orthogonal Latin squares, where 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; transposing both squares.
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
KEYWORD
nonn,more
AUTHOR
Ian Wanless, Dec 22 2015
STATUS
approved