A079245 Number of isomorphism classes of associative commutative non-anti-associative non-anti-commutative closed binary operations on a set of order n.

0, 3, 12, 58

Offset

1,2

Comments

A079231(n)+A079233(n)+A079235(n)+A079237(n)+A079196(n)+A079241(n)+A079243(n)+A079245(n)+A063524(n)=A002489(n)

Each a(n) is equal to the sum of the elements in row n of A079209.

Links

Table of n, a(n) for n=1..4.

Index entries for sequences related to semigroups

Crossrefs

Cf. A079209, A079244, A079231, A079233, A079235, A079237, A079196, A079241, A079243, A063524.

Sequence in context: A012709 A370528 A032268 * A122677 A038177 A163047

Adjacent sequences: A079242 A079243 A079244 * A079246 A079247 A079248

Keyword

nonn

Author

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

Status

approved