Number of (2k+1)-ary quasitrivial semigroups that have two neutral elements on an n-element set.
A308354
Number of (2k+1)-ary quasitrivial semigroups that have two neutral elements on an n-element set.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =24a(4) =200a(5) =2070a(6) =24822a(7) =340648a(8) =5257800a(9) =90174690a(10) =1701190370a(11) =35011502460a(12) =780603478668
External references
- oeis: A308354