Triangular array read by rows. T(n,k) is the number of binary relations R on [n] such that the unique idempotent relation in {R^i:i>=1} is a quasi-order containing exactly k strongly connected components.
A370385
Triangular array read by rows. T(n,k) is the number of binary relations R on [n] such that the unique idempotent relation in {R^i:i>=1} is a quasi-order containing exactly k strongly connected components.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =4a(4) =139a(5) =66a(6) =48a(7) =25575a(8) =9280a(9) =3072a(10) =1536a(11) =18077431a(12) =4498530a(13) =1174800a(14) =322560a(15) =122880
External references
- oeis: A370385