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A266168 Isotopism classes of ordered pairs of orthogonal Latin squares. 4
1, 0, 1, 1, 3, 0, 34, 45927, 2203310919 (list; graph; refs; listen; history; text; internal format)
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.

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. A129732, A266166, A266167.

Sequence in context: A007415 A145222 A058833 * A276913 A012775 A157308

Adjacent sequences:  A266165 A266166 A266167 * A266169 A266170 A266171

KEYWORD

nonn,more

AUTHOR

Ian Wanless, Dec 22 2015

STATUS

approved

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Last modified May 21 10:48 EDT 2019. Contains 323443 sequences. (Running on oeis4.)