Search: id:A079198
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%I A079198
%S A079198 0,2,50,2352
%N A079198 Number of associative non-commutative closed binary operations on a set 
               of order n.
%C A079198 A079192(n)+A079195(n)+A079198(n)+A023815(n)=A002489(n).
%C A079198 Each a(n) is equal to the sum of the products of each element in row 
               n of A079200 and the corresponding element of A079210.
%H A079198 C. van den Bosch, <a href="http://cosmos.ucc.ie/~cjvdb1/html/binops.shtml">
               Closed binary operations on small sets</a>
%H A079198 <a href="Sindx_Se.html#semigroups">Index entries for sequences related 
               to semigroups</a>
%Y A079198 Cf. A023815, A079192, A079195, A079199, A079200.
%Y A079198 Sequence in context: A083941 A080263 A088920 this_sequence A080293 A084107 
               A057943
%Y A079198 Adjacent sequences: A079195 A079196 A079197 this_sequence A079199 A079200 
               A079201
%K A079198 nonn
%O A079198 1,2
%A A079198 Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003

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