a(n) is the number of rooted forests on n nodes that avoid the patterns 321, 2143, and 3142.
A318618
a(n) is the number of rooted forests on n nodes that avoid the patterns 321, 2143, and 3142.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =15a(4) =102a(5) =870a(6) =8910a(7) =106470a(8) =1454040a(9) =22339800a(10) =381364200a(11) =7161323400a(12) =146701724400
External references
- oeis: A318618