A058148 Monoids of order n with 2 idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

1, 3, 9, 30, 175, 3333

Offset

2,2

Links

Table of n, a(n) for n=2..7.

Index entries for sequences related to monoids

Crossrefs

Column 2 of A058147.

Sequence in context: A003604 A357615 A292300 * A031031 A371831 A306526

Adjacent sequences: A058145 A058146 A058147 * A058149 A058150 A058151

Keyword

nonn,more

Author

Christian G. Bower, Nov 14 2000

Status

approved