Number of plane trees with n nodes where the sequence of branches directly under any given node is a chain of distinct multisets.
A319380
Number of plane trees with n nodes where the sequence of branches directly under any given node is a chain of distinct multisets.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =5a(6) =9a(7) =17a(8) =30a(9) =53a(10) =94a(11) =169a(12) =303a(13) =543a(14) =968a(15) =1728a(16) =3080a(17) =5491a(18) =9776a(19) =17415a(20) =31008
External references
- oeis: A319380