Triangle: T(n,k), k<=n: groupoids with no symmetry with n elements and k idempotents.
A038019
Triangle: T(n,k), k<=n: groupoids with no symmetry with n elements and k idempotents.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =4a(5) =1a(6) =969a(7) =1431a(8) =729a(9) =108a(10) =56615456a(11) =75491208a(12) =37741600a(13) =8386560a(14) =697501
External references
- oeis: A038019