Number of n-covers of an unlabeled n-set.

A368186

Number of n-covers of an unlabeled n-set.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =9a(4) =87a(5) =1973a(6) =118827a(7) =20576251a(8) =10810818595

External references