A058130 Number of asymmetric monoids (semigroups with identity) of order n.

1, 2, 4, 19, 128, 1344, 20997, 1479686

Offset

1,2

Links

Table of n, a(n) for n=1..8.

Index entries for sequences related to monoids

Crossrefs

a(n)=A058136(n)*2-A058135(n).

Sequence in context: A272988 A168246 A212923 * A191563 A046082 A048774

Adjacent sequences: A058127 A058128 A058129 * A058131 A058132 A058133

Keyword

nonn,hard

Author

Christian G. Bower, Nov 13 2000

Extensions

a(8) from Christian G. Bower, Dec 26 2006

Status

approved