A079241 Number of isomorphism classes of associative non-commutative non-anti-associative non-anti-commutative closed binary operations on a set of order n.

0, 0, 0, 10, 127, 1588, 26487, 1610379, 3683808608

Offset

0,4

Links

Table of n, a(n) for n=0..8.

Index entries for sequences related to semigroups

Formula

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

a(n) = A027851(n) - A001426(n) - A079243(n). - Andrew Howroyd, Jan 27 2022

Crossrefs

Row sums of A079207.

Cf. A079240 (labeled case), A079231, A079233, A079235, A079237, A079196, A079243, A079245, A063524.

Sequence in context: A002458 A366234 A192600 * A270965 A245923 A218474

Adjacent sequences: A079238 A079239 A079240 * A079242 A079243 A079244

Keyword

nonn,more

Author

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

Extensions

a(0)=0 prepended and a(5)-a(8) added by Andrew Howroyd, Jan 27 2022

Status

approved