Number of commutative inverse semigroups of order n.

A234843

Number of commutative inverse semigroups of order n.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =16a(4) =51a(5) =201a(6) =877a(7) =4443a(8) =25284a(9) =161698a(10) =1145508a(11) =8910291a(12) =75373563a(13) =687950735a(14) =6727985390

External references