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A058117
Number of commutative semigroups of order n with 1 idempotent.
1
1, 2, 5, 16, 62, 342, 3435
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
Index entries for sequences related to semigroups
CROSSREFS
Column 1 of
A058116
.
Sequence in context:
A157314
A374073
A159603
*
A007124
A112951
A124470
Adjacent sequences:
A058114
A058115
A058116
*
A058118
A058119
A058120
KEYWORD
nonn
,
hard
AUTHOR
Christian G. Bower
, Nov 09 2000
STATUS
approved
