Search: id:A079173
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%I A079173
%S A079173 0,5,3306,178981764,2483527537092910,14325590003318891522247046,
%T A079173 50976900301814584087291487087212542367
%N A079173 Number of isomorphism classes of non-associative closed binary operations 
               on a set of order n.
%C A079173 A027851(n)+A079173(n)=A001329(n)
%C A079173 Each a(n) is equal to the sum of the elements in row n of A079174.
%H A079173 C. van den Bosch, <a href="http://cosmos.ucc.ie/~cjvdb1/html/binops.shtml">
               Closed binary operations on small sets</a>
%H A079173 <a href="Sindx_Gre.html#groupoids">Index entries for sequences related 
               to groupoids</a>
%Y A079173 Cf. A027851, A079172, A079174.
%Y A079173 Sequence in context: A076908 A013782 A137841 this_sequence A073826 A159397 
               A024074
%Y A079173 Adjacent sequences: A079170 A079171 A079172 this_sequence A079174 A079175 
               A079176
%K A079173 nonn
%O A079173 1,2
%A A079173 Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003
%E A079173 More terms from Christian G. Bower (bowerc(AT)usa.net), Nov 26 2003

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