Number of ways to choose a set of n nonempty subsets of {1..n} such that it is possible to choose a different element from each.
A368601
Number of ways to choose a set of n nonempty subsets of {1..n} such that it is possible to choose a different element from each.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =32a(4) =1201a(5) =151286a(6) =62453670a(7) =84707326890
External references
- oeis: A368601