Number of n X 2 1..5 arrays with every element value z a city block distance of exactly z from another element value z.
A209021
Number of n X 2 1..5 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) =21083a(6) =217825a(7) =2135214a(8) =20752645a(9) =208916566a(10) =2138876698
External references
- oeis: A209021