Number of ways to reciprocally link elements of an n X 9 array either to themselves or to exactly one king-move neighbor.
A243315
Number of ways to reciprocally link elements of an n X 9 array either to themselves or to exactly one king-move neighbor.
Terms
- a(0) =1a(1) =55a(2) =237472a(3) =371654153a(4) =757341382671
External references
- oeis: A243315