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Number of nX1 1..6 arrays with every element value z a city block distance of exactly z from another element value z
1

%I #6 Mar 31 2012 12:37:26

%S 0,1,1,3,3,16,24,98,161,515,956,2641,5686,14869,33986,84574,196092,

%T 474284,1110888,2665506,6280574,15027417,35701279,85266546,202157753,

%U 480306818,1140496671,2711160051,6442522473,15326524978,36425732326

%N Number of nX1 1..6 arrays with every element value z a city block distance of exactly z from another element value z

%C Column 1 of A209058

%H R. H. Hardin, <a href="/A209055/b209055.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=7

%e ..6....3....4....6....1....3....2....1....5....2....3....1....2....1....1....5

%e ..4....4....1....1....1....4....2....1....1....2....3....1....4....1....1....5

%e ..1....2....1....1....1....2....2....2....1....2....3....1....2....4....1....1

%e ..1....3....1....1....2....3....2....2....1....2....3....3....3....1....1....1

%e ..1....2....4....1....2....2....2....2....2....1....3....1....2....1....1....1

%e ..4....4....1....1....2....4....1....2....5....1....3....1....4....1....1....5

%e ..6....2....1....6....2....3....1....2....2....1....3....3....3....4....1....5

%K nonn

%O 1,4

%A _R. H. Hardin_ Mar 04 2012