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Number of nX7 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z
1

%I #5 Mar 31 2012 12:37:28

%S 185,722,5460,54450,510378,4657352,43249360,402144800,3725851316,

%T 34509848328,320002445430,2967452389778,27506545295520,

%U 254980859279112,2363917557528510,21914994165576192,203160244306365584

%N Number of nX7 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z

%C Column 7 of A209374

%H R. H. Hardin, <a href="/A209373/b209373.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 07 2012