Number of nX4 1..4 arrays with every element value z a city block distance of exactly z from another element value z.
A209393
Number of nX4 1..4 arrays with every element value z a city block distance of exactly z from another element value z.
Terms
- a(0) =3a(1) =152a(2) =22416a(3) =4488765a(4) =816320455
External references
- oeis: A209393