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A058132
Number of self-converse monoids (semigroups with identity) of order n.
4
0, 1, 2, 5, 19, 84, 509, 3901, 48957
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..8.
Index entries for sequences related to monoids
FORMULA
a(n) =
A058133
(n)*2 -
A058129
(n).
CROSSREFS
Cf.
A058129
,
A058133
.
Sequence in context:
A179566
A107377
A286886
*
A286071
A002851
A354621
Adjacent sequences:
A058129
A058130
A058131
*
A058133
A058134
A058135
KEYWORD
nonn
,
more
AUTHOR
Christian G. Bower
, Nov 13 2000
EXTENSIONS
a(8) from
Max Alekseyev
, Jul 13 2009
a(0) prepended by
Jianing Song
, Oct 26 2019
STATUS
approved
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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)