A234844 Number of inverse monoids of order n.

1, 2, 4, 11, 27, 89, 310, 1311, 6253, 34325, 212247, 1466180, 11167987, 92889294, 836021796

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), A234845 (commutative inverse monoids).

Sequence in context: A131482 A234845 A148131 * A205504 A290337 A099412

Adjacent sequences: A234841 A234842 A234843 * A234845 A234846 A234847

Keyword

nonn,hard,more

Author

Joerg Arndt, Dec 31 2013

Status

approved