A058136 - OEIS

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A058136

Number of asymmetric monoids (semigroups with identity) of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

3

1, 2, 4, 16, 91, 833, 11771

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..7.

Index entries for sequences related to monoids

CROSSREFS

a(n)=(A058130(n)+A058135(n))/2.

Sequence in context: A013115 A291286 A007171 * A156335 A026089 A052835

Adjacent sequences: A058133 A058134 A058135 * A058137 A058138 A058139

KEYWORD

nonn,more

AUTHOR

Christian G. Bower, Nov 13 2000

STATUS

approved