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A351731
Number of labeled idempotent monoids of order n.
3
1, 2, 12, 140, 3020, 100362, 4768624, 305498328, 25293331098, 2619996058190
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
FORMULA
a(n) = n *
A351731
(n-1).
CROSSREFS
Main diagonal of
A058157
.
Cf.
A058153
,
A351730
.
Sequence in context:
A287885
A091144
A275829
*
A240387
A087800
A009747
Adjacent sequences:
A351728
A351729
A351730
*
A351732
A351733
A351734
KEYWORD
nonn
,
hard
,
more
AUTHOR
Andrew Howroyd
, Feb 17 2022
STATUS
approved
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Last modified September 12 09:47 EDT 2024. Contains 375850 sequences. (Running on oeis4.)