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A058132 Number of self-converse monoids (semigroups with identity) of order n. 4
0, 1, 2, 5, 19, 84, 509, 3901, 48957 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
FORMULA
a(n) = A058133(n)*2 - A058129(n).
CROSSREFS
Sequence in context: A179566 A107377 A286886 * A286071 A002851 A354621
KEYWORD
nonn,more
AUTHOR
Christian G. Bower, Nov 13 2000
EXTENSIONS
a(8) from Max Alekseyev, Jul 13 2009
a(0) prepended by Jianing Song, Oct 26 2019
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)