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A058131
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Number of isomorphism classes of commutative monoids (commutative semigroups with identity) of order n.
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2
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0, 1, 2, 5, 19, 78, 421, 2637, 20486, 246458, 11833361
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..10.
Remigiusz Durka and Kamil Grela, On the number of possible resonant algebras, arXiv:1911.12814 [hep-th], 2019.
Eric Postpischil, Posting to sci.math newsgroup, May 21 1990
Eric Weisstein's World of Mathematics, Commutative Monoid
Eric Weisstein's World of Mathematics, Additive Cellular Automaton
Stephen Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 952.
Index entries for sequences related to monoids
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CROSSREFS
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Row sums of A058142.
Cf. A001426, A058129, A058155 (labeled).
Sequence in context: A150026 A150027 A277969 * A222055 A228569 A204328
Adjacent sequences: A058128 A058129 A058130 * A058132 A058133 A058134
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KEYWORD
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nonn,more
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AUTHOR
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Christian G. Bower, Nov 13 2000
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EXTENSIONS
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a(0) prepended by Jianing Song, Oct 26 2019
a(8) and a(9) from Alex Meiburg, Oct 20 2021
a(10) from Andrew Howroyd, Feb 15 2022
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STATUS
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approved
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