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A058115 Number of asymmetric idempotent semigroups of order n. 2
1, 1, 1, 3, 12, 68, 502, 4158 (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 A058113.
Sequence in context: A366228 A296979 A004127 * A101313 A257605 A265886
Adjacent sequences: A058112 A058113 A058114 * A058116 A058117 A058118
KEYWORD
nonn,hard
AUTHOR
Christian G. Bower, Nov 09 2000
EXTENSIONS
Updated Feb 19 2001
STATUS
approved

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Last modified May 14 03:35 EDT 2024. Contains 372528 sequences. (Running on oeis4.)