A058104 - OEIS

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A058104

Number of asymmetric semigroups of order n.

2

1, 1, 3, 15, 112, 1221, 19684, 1458882, 3667253972, 105923135799007

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..9.

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

Index entries for sequences related to semigroups

FORMULA

a(n) = A079175(n, A027423(n)).

CROSSREFS

Cf. A027851, A058113, A079175.

Sequence in context: A089945 A135083 A323772 * A298390 A299508 A299308

Adjacent sequences: A058101 A058102 A058103 * A058105 A058106 A058107

KEYWORD

nonn,hard

AUTHOR

Christian G. Bower, Nov 09 2000. Updated Feb 19 2001.

EXTENSIONS

a(8)-a(9) added from the Distler-Kelsey reference by Andrew Howroyd, Jan 26 2022

STATUS

approved