A079187 Number of isomorphism classes of non-anti-commutative closed binary operations (groupoids) on a set of order n.

1, 4, 2334, 147124304, 2216860823492185, 13395780829563177947362200, 48974776899548402559651008669035131863, 151979850442580207421627199010701131897617064179661376

Offset

1,2

Comments

A079187(n)+A079190(n)=A001329(n).

Each a(n) is equal to the sum of the elements in row n of A079188.

Links

Table of n, a(n) for n=1..8.

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

Index entries for sequences related to groupoids

Crossrefs

Cf. A079186, A079188, A079190.

Sequence in context: A097476 A047676 A280790 * A131587 A066850 A066837

Adjacent sequences: A079184 A079185 A079186 * A079188 A079189 A079190

Keyword

nonn

Author

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

Extensions

Edited, corrected and extended by Christian G. Bower, Dec 12 2003

Status

approved