A058131 Number of isomorphism classes of commutative monoids (commutative semigroups with identity) of order n.
0, 1, 2, 5, 19, 78, 421, 2637, 20486, 246458, 11833361
Offset: 0
Links
- 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
Extensions
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