This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A266167 #20 Dec 10 2021 11:08:36 %S A266167 1,0,1,1,2,0,20,23362,1101734942 %N A266167 Number of isotopism classes of unordered pairs of orthogonal Latin squares. %C A266167 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. %C A266167 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. %H A266167 J. Egan and I. M. Wanless, <a href="http://dx.doi.org/10.1090/mcom/3010">Enumeration of MOLS of small order</a>, Mathematics of Computation 85, 2016, 799-824. %H A266167 Ian Wanless, <a href="http://users.monash.edu.au/~iwanless/data/MOLS/">Data on MOLS</a> %Y A266167 Cf. A072377, A129732, A266166, A266168, A266169. %K A266167 nonn,more %O A266167 1,5 %A A266167 _Ian Wanless_, Dec 22 2015