Triangular array read by rows. T(n,k) is the number of strongly connected binary relations on [n] (A186081) with period k, n >= 1, 1<=k<=n.
A367948
Triangular array read by rows. T(n,k) is the number of strongly connected binary relations on [n] (A186081) with period k, n >= 1, 1<=k<=n.
Terms
- a(0) =1a(1) =3a(2) =1a(3) =139a(4) =3a(5) =2a(6) =25575a(7) =103a(8) =12a(9) =6a(10) =18077431a(11) =4815a(12) =230a(13) =60a(14) =24
External references
- oeis: A367948