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A320420
Number of monoids of order n that are not groups.
0
0, 0, 1, 6, 33, 227, 2235, 31558, 1668992
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OFFSET
0,4
LINKS
Table of n, a(n) for n=0..8.
FORMULA
a(n) =
A058129
(n) -
A000001
(n).
CROSSREFS
Cf.
A058129
,
A000001
.
Sequence in context:
A012326
A277260
A112903
*
A215707
A137970
A024079
Adjacent sequences:
A320417
A320418
A320419
*
A320421
A320422
A320423
KEYWORD
nonn
,
more
AUTHOR
Steve Szabo
, Jan 07 2019
STATUS
approved
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Last modified September 8 16:50 EDT 2024. Contains 375753 sequences. (Running on oeis4.)