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A057997 Number of labeled loops (quasigroups with an identity element). 2

%I #6 Mar 30 2012 17:37:11

%S 1,2,3,16,280,56448,118594560,4282251214848,3398378138678329344,

%T 75807214831601328114892800

%N Number of labeled loops (quasigroups with an identity element).

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

%Y a(n)=A000315(n)*n. Cf. A057771.

%K nonn,hard

%O 1,2

%A _Christian G. Bower_, Nov 20 2000

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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)