A simple grammar: rooted ordered set partitions.
A052882
A simple grammar: rooted ordered set partitions.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =9a(4) =52a(5) =375a(6) =3246a(7) =32781a(8) =378344a(9) =4912515a(10) =70872610a(11) =1124723193a(12) =19471590876a(13) =365190378735
External references
- oeis: A052882