|
|
A058107
|
|
Number of asymmetric semigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).
|
|
2
|
|
|
|
OFFSET
|
0,3
|
|
LINKS
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,hard
|
|
AUTHOR
|
|
|
EXTENSIONS
|
Updated Feb 19 2001
|
|
STATUS
|
approved
|
|
|
|