A209606 - OEIS

%I #5 Mar 31 2012 12:37:29

%S 2,45,955,11879,151736,1947347,24912066,322047969,4162324219,

%T 53725706448,693454797025,8950269164167,115522311347383,

%U 1491104128677150,19246371866665817,248421180186787884,3206476873520078239

%N Number of nX4 1..2 arrays with every element value z a city block distance of exactly z from another element value z

%C Column 4 of A209610

%H R. H. Hardin, <a href="/A209606/b209606.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..1..1..1..2....1..1..1..2....2..2..2..2....1..1..2..2....2..2..2..1

%e ..2..2..2..2....1..1..2..1....2..2..2..1....1..2..2..2....2..2..1..1

%e ..2..2..2..1....1..1..2..1....2..1..2..1....1..2..2..1....1..2..2..2

%e ..2..1..1..1....1..2..2..2....1..1..2..1....1..2..2..1....1..2..2..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 10 2012