Number of nX4 1..2 arrays with every element value z a city block distance of exactly z from another element value z.
A209606
Number of nX4 1..2 arrays with every element value z a city block distance of exactly z from another element value z.
Terms
- a(0) =2a(1) =45a(2) =955a(3) =11879a(4) =151736a(5) =1947347a(6) =24912066a(7) =322047969a(8) =4162324219a(9) =53725706448a(10) =693454797025
External references
- oeis: A209606