Location via proxy:   [ UP ]  
[Report a bug]   [Manage cookies]                
The OEIS is supported by the many generous donors to the OEIS Foundation.
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A351731
Number of labeled idempotent monoids of order n.
3
1, 2, 12, 140, 3020, 100362, 4768624, 305498328, 25293331098, 2619996058190
(list; graph; refs; listen; history; text; internal format)
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

Lookup Welcome Wiki Register Music Plot 2 Demos Index WebCam Contribute Format Style Sheet Transforms Superseeker Recents
The OEIS Community
Maintained by The OEIS Foundation Inc.
Last modified September 29 00:07 EDT 2024. Contains 376297 sequences.
License Agreements, Terms of Use, Privacy Policy