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A058109 Semigroups of order n with 1 idempotent. 1
1, 2, 5, 20, 171, 5284, 1224331 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
CROSSREFS
Column 1 of A058108.
Sequence in context: A184730 A181076 A156871 * A005331 A261005 A158872
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.)