A058107 Number of asymmetric semigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

1, 1, 3, 12, 78, 746, 10965, 746277

Offset

0,3

Links

Table of n, a(n) for n=0..7.

Index entries for sequences related to semigroups

Crossrefs

Cf. A001423.

Sequence in context: A108043 A377534 A058561 * A213139 A381945 A023879

Adjacent sequences: A058104 A058105 A058106 * A058108 A058109 A058110

Keyword

nonn,hard

Author

Christian G. Bower, Nov 09 2000

Extensions

Updated Feb 19 2001

Status

approved