Number of inverse semigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).
A001428
Number of inverse semigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =52a(5) =208a(6) =911a(7) =4637a(8) =26422a(9) =169163a(10) =1198651a(11) =9324047a(12) =78860687a(13) =719606005a(14) =7035514642
External references
- oeis: A001428