A234843 Number of commutative inverse semigroups of order n.

1, 2, 5, 16, 51, 201, 877, 4443, 25284, 161698, 1145508, 8910291, 75373563, 687950735, 6727985390

Offset: 1

Author

Joerg Arndt, Dec 31 2013

Keywords

• nonn
• hard
• more

Links

• 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).