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A234845 Number of commutative inverse monoids of order n. 3
1, 2, 4, 11, 27, 87, 300, 1259, 5988, 32812, 202784, 1400541, 10669344, 88761928, 799112310 (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), A234843 (commutative inverse semigroups), A234844 (inverse monoids).

Sequence in context: A319616 A148130 A131482 * A148131 A234844 A205504

Adjacent sequences:  A234842 A234843 A234844 * A234846 A234847 A234848

KEYWORD

nonn,hard,more

AUTHOR

Joerg Arndt, Dec 31 2013

STATUS

approved

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Last modified August 6 17:06 EDT 2020. Contains 336255 sequences. (Running on oeis4.)