A222406 Number of isomorphism types of automorphism groups of semigroups of order n.

1, 2, 3, 5, 10, 14, 24, 38, 65

Offset

1,2

Links

Table of n, a(n) for n=1..9.

A. Distler and T. Kelsey, The semigroups of order 9 and their automorphism groups, arXiv preprint arXiv:1301.6023 [math.CO], 2013.

Crossrefs

Cf. A174511.

Sequence in context: A090859 A004681 A338589 * A044953 A297130 A044815

Adjacent sequences: A222403 A222404 A222405 * A222407 A222408 A222409

Keyword

nonn,more,hard,nice

Author

N. J. A. Sloane, Feb 19 2013

Status

approved