A079177 Number of isomorphism classes of non-anti-associative closed binary operations on a set of order n.

0, 8, 3320, 178964172

Offset

1,2

Comments

A079177(n)+A079180(n)=A001329(n).

Each a(n) is equal to the sum of the elements in row n of A079178.

Links

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

C. van den Bosch, Closed binary operations on small sets

Index entries for sequences related to groupoids

Crossrefs

Cf. A079176, A079178, A079180.

Sequence in context: A281323 A145260 A201100 * A298279 A299372 A299141

Adjacent sequences: A079174 A079175 A079176 * A079178 A079179 A079180

Keyword

nonn

Author

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

Status

approved