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A058122 Number of self-converse idempotent semigroups of order n. +0
3
1, 1, 1, 2, 6, 19, 68, 285 (list; graph; listen)
OFFSET

0,4
LINKS

Index entries for sequences related to semigroups

CROSSREFS

Main diagonal of A058118.

Sequence in context: A150103 A150104 A145868 this_sequence A150105 A150106 A150107

Adjacent sequences: A058119 A058120 A058121 this_sequence A058123 A058124 A058125

KEYWORD

nonn,hard

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), Nov 10 2000

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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