Number of unlabeled clutters (connected antichains) spanning up to n vertices without singleton edges.
A304981
Number of unlabeled clutters (connected antichains) spanning up to n vertices without singleton edges.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =19a(5) =176a(6) =16118a(7) =489996568
External references
- oeis: A304981