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A058107 Number of asymmetric semigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator). +0
3
1, 1, 3, 12, 78, 746, 10965, 746277 (list; graph; listen)
OFFSET

0,3
LINKS

Index entries for sequences related to semigroups

CROSSREFS

Cf. A001423.

Adjacent sequences: A058104 A058105 A058106 this_sequence A058108 A058109 A058110

Sequence in context: A121421 A108043 A058561 this_sequence A023879 A084565 A023881

KEYWORD

nonn,hard

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), Nov 09 2000

EXTENSIONS

Updated Feb 19 2001

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Last modified November 8 20:39 EST 2009. Contains 166234 sequences.

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