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A286318 Number of species of connected partial Latin squares of size n. 1

%I #9 May 14 2017 22:27:39

%S 1,1,3,11,36,213,1405,12274,125235,1490851,20003121,299274006

%N Number of species of connected partial Latin squares of size n.

%C The size of a partial Latin square (PLS) is the number of filled entries, not the order of the matrix. The species of a PLS are all those PLSs you can get by permuting the rows, columns and symbols, and also by permuting these three roles themselves. Empty rows and columns are ignored. A PLS is connected if its associated graph (entries are vertices and edges show which entries share their row column or symbol) is connected.

%D H. Dietrich and I. M. Wanless, Small partial Latin squares that embed in an infinite group but not into any finite group, J. Symbolic Comput., to appear. DOI 10.1016/j.jsc.2017.04.002.

%Y Cf. A286317 (is for the same objects but without the requirement to be connected).

%K nonn,more

%O 1,3

%A _Ian Wanless_, May 06 2017

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Last modified April 17 20:17 EDT 2024. Contains 371767 sequences. (Running on oeis4.)