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A058109
Semigroups of order n with 1 idempotent.
1
1, 2, 5, 20, 171, 5284, 1224331
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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
A058108
.
Sequence in context:
A184730
A181076
A156871
*
A005331
A261005
A158872
Adjacent sequences:
A058106
A058107
A058108
*
A058110
A058111
A058112
KEYWORD
nonn
,
hard
AUTHOR
Christian G. Bower
, Nov 09 2000
EXTENSIONS
Updated Feb 19 2001
STATUS
approved
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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)