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A058132 Number of self-converse monoids (semigroups with identity) of order n. 4

%I #15 Oct 27 2019 14:27:37

%S 0,1,2,5,19,84,509,3901,48957

%N Number of self-converse monoids (semigroups with identity) of order n.

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

%F a(n) = A058133(n)*2 - A058129(n).

%Y Cf. A058129, A058133.

%K nonn,more

%O 0,3

%A _Christian G. Bower_, Nov 13 2000

%E a(8) from _Max Alekseyev_, Jul 13 2009

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

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Last modified March 29 03:51 EDT 2024. Contains 371264 sequences. (Running on oeis4.)