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).

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

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