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A058131 Number of commutative monoids (commutative semigroups with identity) of order n. 2

%I

%S 0,1,2,5,19,78,421,2637

%N Number of commutative monoids (commutative semigroups with identity) of order n.

%D S. Wolfram, A New Kind of Science. Champaign, IL: Wolfram Media, p. 952, 2002.

%H Remigiusz Durka, Kamil Grela, <a href="https://arxiv.org/abs/1911.12814">On the number of possible resonant algebras</a>, arXiv:1911.12814 [hep-th], 2019.

%H Eric Postpischil, <a href="https://groups.google.com/forum/?hl=en#!msg/sci.math/nU-hg-FFSFo/iIB3Lul1sAEJ">Posting to sci.math newsgroup, May 21 1990</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/CommutativeMonoid.html">Commutative Monoid</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/AdditiveCellularAutomaton.html">Additive Cellular Automaton</a>

%H <a href="/index/Mo#monoids">Index entries for sequences related to monoids</a>

%K nonn,more

%O 0,3

%A _Christian G. Bower_, Nov 13 2000

%E a(0) prepended by _Jianing Song_, Oct 26 2019

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Last modified November 24 07:33 EST 2020. Contains 338607 sequences. (Running on oeis4.)