Number of unlabeled hypertrees (connected antichains with no cycles) spanning up to n vertices and allowing singleton edges.

A304386

Number of unlabeled hypertrees (connected antichains with no cycles) spanning up to n vertices and allowing singleton edges.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =15a(4) =50a(5) =200a(6) =907a(7) =4607a(8) =25077a(9) =144337a(10) =863678a(11) =5329994a(12) =33697112a(13) =217317986a(14) =1424880997a(15) =9474795661a(16) =63769947778a(17) =433751273356

External references