Number of binary rooted trees with n leaves of n colors and all non-leaf nodes having out-degree 2.
A319580
Number of binary rooted trees with n leaves of n colors and all non-leaf nodes having out-degree 2.
Terms
- a(0) =1a(1) =3a(2) =18a(3) =215a(4) =3600a(5) =80136a(6) =2213036a(7) =73068543a(8) =2806959015a(9) =123002168300
External references
- oeis: A319580