A058115 Number of asymmetric idempotent semigroups of order n.

1, 1, 1, 3, 12, 68, 502, 4158

Offset

0,4

Links

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

Index entries for sequences related to semigroups

Crossrefs

Main diagonal of A058113.

Sequence in context: A366228 A296979 A004127 * A101313 A257605 A265886

Adjacent sequences: A058112 A058113 A058114 * A058116 A058117 A058118

Keyword

nonn,hard

Author

Christian G. Bower, Nov 09 2000

Extensions

Updated Feb 19 2001

Status

approved