Number of nodes at n-th level in tree in which top node is 1; each node k has children labeled 1, 2, ..., (k+1)^2 at next level.
A147780
Number of nodes at n-th level in tree in which top node is 1; each node k has children labeled 1, 2, ..., (k+1)^2 at next level.
Terms
- a(0) =1a(1) =4a(2) =54a(3) =8422a(4) =464862602
External references
- oeis: A147780