Number of nX2 1..7 arrays with every element value z a city block distance of exactly z from another element value z.
A209213
Number of nX2 1..7 arrays with every element value z a city block distance of exactly z from another element value z.
Terms
- a(0) =1a(1) =2a(2) =16a(3) =152a(4) =1721a(5) =24255a(6) =399281a(7) =6747646
External references
- oeis: A209213