A079193 Number of isomorphism classes of non-associative non-commutative closed binary operations on a set of order n.

0, 4, 3189, 178937854, 2483527282663335, 14325590003288422852078277, 50976900301814584087291456618542388746

Offset: 1

Author

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

Keywords

• nonn

Comments

A079193(n)+A079196(n)+A079199(n)+A001426(n)=A001329(n).

Each a(n) is equal to the sum of the elements in row n of A079194.

Links

• C. van den Bosch, Closed binary operations on small sets
• Index entries for sequences related to groupoids

Crossrefs

Cf. A079192, A079194, A079196, A079199, A001426.

a(n) = A001329(n)-A001425(n)-A027851(n)+A001426(n).

a(n)+A079196(n)+A079199(n)+A001426(n)=A001329(n).

Extensions

Edited and extended by Christian G. Bower, Nov 26 2003