A079244 - OEIS

%I #6 Jul 10 2011 18:22:18

%S 0,6,63,1140

%N Number of associative commutative non-anti-associative non-anti-commutative closed binary operations on a set of order n.

%C A079230(n)+A079232(n)+A079234(n)+A079236(n)+A079195(n)+A079240(n)+A079242(n)+A079244(n)+A063524(n)=A002489(n)

%C Each a(n) is equal to the sum of the products of each element in row n of A079209 and the corresponding element of A079210.

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

%Y Cf. A079209, A079245, A079230, A079232, A079234, A079236, A079195, A079240, A079242, A063524.

%K nonn

%O 1,2

%A Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003