Number of nX2 1..4 arrays with every element value z a city block distance of exactly z from another element value z.
A209391
Number of nX2 1..4 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) =1449a(5) =11655a(6) =89469a(7) =705803a(8) =5771383a(9) =45213223a(10) =344221421a(11) =2576621623a(12) =19476715122a(13) =147713174987
External references
- oeis: A209391