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A058129
Number of nonisomorphic monoids (semigroups with identity) of order n.
16
0, 1, 2, 7, 35, 228, 2237, 31559, 1668997
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..8.
Remigiusz Durka and Kamil Grela,
On the number of possible resonant algebras
, arXiv:1911.12814 [hep-th], 2019.
Najwa Ghannoum,
Investigation of finite categories
, Doctoral thesis, Univ. Côte d'Azur (France); Univ. Libanaise (Lebanon), tel-0394832 [math.CT], 2022.
Eric Postpischil,
Posting to sci.math newsgroup, May 21 1990
Clayton Cristiano Silva,
Irreducible Numerical Semigroups
, University of Campinas, São Paulo, Brazil (2019).
Index entries for sequences related to monoids
FORMULA
a(n) = 2*
A058133
(n) -
A058132
(n).
a(n) <
A027851
(n) except for equality iff n = 1. -
M. F. Hasler
, Dec 10 2018
CROSSREFS
Cf.
A058132
,
A058133
.
Cf.
A027851
(number of all nonisomorphic semigroups).
Sequence in context:
A014307
A000154
A003713
*
A101514
A247240
A266356
Adjacent sequences:
A058126
A058127
A058128
*
A058130
A058131
A058132
KEYWORD
nonn
,
hard
,
more
AUTHOR
Christian G. Bower
, Nov 13 2000
EXTENSIONS
a(8) from
Christian G. Bower
, Dec 26 2006
a(0) = 0 prepended by
M. F. Hasler
, Dec 10 2018
STATUS
approved
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Last modified April 23 03:30 EDT 2024. Contains 371906 sequences. (Running on oeis4.)