A084965 Number of labeled totally ordered semigroups with n elements.

1, 1, 6, 44, 386, 3852, 42640, 516791, 6817378, 98091071, 1569786228

Offset: 0

Author

Michael Somos, Jun 15 2003

Keywords

• nonn
• hard
• more

Links

• Petr Gajdoš and Martin Kuřil, Ordered semigroups of size at most 7 and linearly ordered semigroups of size at most 10, Semigroup Forum, 89 (2014), 639-663.
• J. Slaney, FINDER: Finite Domain Enumerator

Crossrefs

Cf. A023814.

Extensions

a(9)-a(10) from Gajdoš and Kuřil added by Andrey Zabolotskiy, Mar 24 2021