A234845 Number of commutative inverse monoids of order n.

1, 2, 4, 11, 27, 87, 300, 1259, 5988, 32812, 202784, 1400541, 10669344, 88761928, 799112310

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: A148130 A350030 A131482 * A148131 A234844 A205504

Adjacent sequences: A234842 A234843 A234844 * A234846 A234847 A234848

Keyword

nonn,hard,more

Author

Joerg Arndt, Dec 31 2013

Status

approved