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%I #6 Mar 31 2012 12:37:30
%S 1,2,5,12,33,87,227,583,1538,4067,10633,27837,72387,188811,493437,
%T 1288622,3355810,8740288,22783725,59403150,154824944,403509362,
%U 1051651919,2740858097,7144656505,18623531350,48542955448,126526434447
%N Number of nX1 0..4 arrays with every element value z a city block distance of exactly z from another element value z
%C Column 1 of A209720
%H R. H. Hardin, <a href="/A209717/b209717.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=7
%e ..3....3....0....1....2....0....4....3....2....1....1....3....0....0....1....0
%e ..4....0....0....1....4....0....4....4....2....1....1....3....0....0....1....0
%e ..2....2....4....4....2....1....0....2....2....1....0....4....2....4....1....0
%e ..3....3....0....1....3....1....3....3....2....1....0....3....0....0....1....2
%e ..2....2....0....1....2....1....4....2....2....1....0....3....2....1....2....2
%e ..4....1....0....1....4....1....4....4....2....0....0....0....1....1....0....2
%e ..3....1....4....4....3....0....3....2....2....0....0....4....1....4....2....2
%K nonn
%O 1,2
%A _R. H. Hardin_ Mar 12 2012
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