Search: id:A079188
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%I A079188
%S A079188 0,0,4,1,4,44,2285,0,0,0,24,64,212,35240,147088764
%N A079188 Number of isomorphism classes of non-anti-commutative closed binary operations 
               on a set of order n, listed by class size.
%C A079188 A079188(n)+A079191(n)=A079171(n).
%C A079188 Elements per row: 1,2,4,8,16,30,... (given by A027423, number of positive 
               divisors of n!)
%C A079188 First four rows: 0; 0,4; 1,4,44,2285; 0,0,0,24,64,212,35240,147088764
%C A079188 A079176(x) is equal to the sum of the products of each element in row 
               x of this sequence and the corresponding element of A079210.
%C A079188 The sum of each row x of this sequence is given by A079177(x).
%H A079188 C. van den Bosch, <a href="http://cosmos.ucc.ie/~cjvdb1/html/binops.shtml">
               Closed binary operations on small sets</a>
%H A079188 <a href="Sindx_Gre.html#groupoids">Index entries for sequences related 
               to groupoids</a>
%Y A079188 Cf. A079186, A079187, A079191.
%Y A079188 Sequence in context: A066808 A033918 A136467 this_sequence A076810 A061642 
               A143313
%Y A079188 Adjacent sequences: A079185 A079186 A079187 this_sequence A079189 A079190 
               A079191
%K A079188 nonn,tabf
%O A079188 1,3
%A A079188 Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003

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