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Number of nonisomorphic commutative groupoids with no idempotents.
2

%I #12 Feb 15 2015 10:15:46

%S 1,0,1,38,13872,83360520,10203847031340,31023254154131753920,

%T 2765562268014305034000397632,8332535835277886736134596954072281240,

%U 960864308045670310058158724983067048253497223280

%N Number of nonisomorphic commutative groupoids with no idempotents.

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

%Y Cf. A001329, A001425, A038021.

%K nonn

%O 0,4

%A _Christian G. Bower_, Feb 15 1998 and May 15 1998