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A346414 Number of labeled totally ordered commutative semigroups. 0
1, 1, 4, 20, 114, 710, 4726, 33157, 243048, 1850817, 14590692 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..10.

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.

CROSSREFS

Cf. A023815.

Sequence in context: A108447 A287512 A211248 * A028475 A128327 A320615

Adjacent sequences: A346411 A346412 A346413 * A346415 A346416 A346417

KEYWORD

nonn,hard,more

AUTHOR

Peter Jipsen, Jul 15 2021

STATUS

approved

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Last modified January 28 14:01 EST 2023. Contains 359895 sequences. (Running on oeis4.)