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Search: id:A166487
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| A166487 |
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Number of isotopy classes of (unipotent) SOLSSOMs of order n |
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+0
4
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OFFSET
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4,4
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COMMENT
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A SOLSSOM is a self-orthogonal Latin square with a symmetric orthogonal mate. For even n, the enumeration results given here are with respect to unipotent SOLSSOMs only (i.e. SOLSSOMs for which the symmetric mate has a constant diagonal).
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REFERENCES
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A.P. Burger, M.P. Kidd and J.H. van Vuuren, There is no unipotent SOLSSOM of order 10, Submitted to Journal of Combinatorial Designs.
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CROSSREFS
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Cf. A166488, A166489, A166490
Sequence in context: A103464 A018980 A012990 this_sequence A137102 A091145 A000697
Adjacent sequences: A166484 A166485 A166486 this_sequence A166488 A166489 A166490
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KEYWORD
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hard,more,nonn
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AUTHOR
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Martin Philip Kidd (14623617(AT)sun.ac.za), Oct 21 2009
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