Number of ternary trees with n edges and such that the first leaf in the preorder traversal is at level 1.
A121446
Number of ternary trees with n edges and such that the first leaf in the preorder traversal is at level 1.
Terms
- a(0) =3a(1) =3a(2) =10a(3) =42a(4) =198a(5) =1001a(6) =5304a(7) =29070a(8) =163438a(9) =937365a(10) =5462730a(11) =32256120a(12) =192565800a(13) =1160346492a(14) =7048030544a(15) =43108428198a(16) =265276342782
External references
- oeis: A121446