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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
1, 3, 9, 30, 175, 3333
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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
A306526
A034550
Adjacent sequences:
A058145
A058146
A058147
*
A058149
A058150
A058151
KEYWORD
nonn
,
more
AUTHOR
Christian G. Bower
, Nov 14 2000
STATUS
approved
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Last modified March 29 04:59 EDT 2024. Contains 371264 sequences. (Running on oeis4.)