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A234843
Number of commutative inverse semigroups of order n.
3
1, 2, 5, 16, 51, 201, 877, 4443, 25284, 161698, 1145508, 8910291, 75373563, 687950735, 6727985390
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..15.
Martin E. Malandro, Enumeration of finite inverse semigroups, arXiv:1312.7192 [math.CO]
CROSSREFS
Cf. A001428 (inverse semigroups), A234844 (inverse monoids), A234845 (commutative inverse monoids).
Sequence in context: A268213 A231357 A303477 * A011819 A148390 A232317
Adjacent sequences: A234840 A234841 A234842 * A234844 A234845 A234846
KEYWORD
nonn,hard,more
AUTHOR
Joerg Arndt, Dec 31 2013
STATUS
approved

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Last modified September 28 09:23 EDT 2024. Contains 376288 sequences.
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