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Number of quasigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).
1

%I #6 Mar 30 2012 17:37:12

%S 1,1,1,4,24,746,567207

%N Number of quasigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

%H <a href="/index/Qua#quasigroups">Index entries for sequences related to quasigroups</a>

%Y a(n)=(A057991(n)+A057993)/2.

%K nonn,more

%O 0,4

%A _Christian G. Bower_, Nov 20 2000