Number of series-reduced rooted trees whose leaves are sets (not necessarily disjoint) with multiset union a strongly normal multiset of size n.
A330625
Number of series-reduced rooted trees whose leaves are sets (not necessarily disjoint) with multiset union a strongly normal multiset of size n.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =14a(4) =123a(5) =1330a(6) =19694
External references
- oeis: A330625