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A058122
Number of self-converse idempotent semigroups of order n.
2
1, 1, 1, 2, 6, 19, 68, 285
(list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
LINKS
Table of n, a(n) for n=0..7.
Index entries for sequences related to semigroups
CROSSREFS
Main diagonal of A058118.
Sequence in context: A150104 A145868 A376077 * A150105 A150106 A150107
Adjacent sequences: A058119 A058120 A058121 * A058123 A058124 A058125
KEYWORD
nonn,hard
AUTHOR
Christian G. Bower, Nov 10 2000
STATUS
approved

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Last modified October 4 21:32 EDT 2024. Contains 376525 sequences.
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