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A058106 Number of self-converse asymmetric semigroups of order n. 1
1, 1, 3, 9, 44, 271, 2246, 33672 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..7.

Index entries for sequences related to semigroups

CROSSREFS

Cf. A029851.

Sequence in context: A218921 A262128 A028858 * A021103 A222662 A209977

Adjacent sequences:  A058103 A058104 A058105 * A058107 A058108 A058109

KEYWORD

nonn,hard

AUTHOR

Christian G. Bower, Nov 09 2000

EXTENSIONS

Updated Feb 19 2001

STATUS

approved

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Last modified October 16 02:45 EDT 2018. Contains 316252 sequences. (Running on oeis4.)