Sum of the levels of the first leaf (in the preorder traversal) over all hex trees with n edges.
A126187
Sum of the levels of the first leaf (in the preorder traversal) over all hex trees with n edges.
Terms
- a(0) =3a(1) =19a(2) =96a(3) =453a(4) =2085a(5) =9513a(6) =43323a(7) =197542a(8) =903141a(9) =4142565a(10) =19067202a(11) =88065360a(12) =408108285a(13) =1897265405a(14) =8846769300a(15) =41368049400a(16) =193950461985a(17) =911564782065
External references
- oeis: A126187