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A233109 Number of nX4 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order 1

%I #4 Dec 04 2013 07:12:33

%S 23,6046,2154065,794723482,294285758398,109015274761891,

%T 40385221182281560,14960955484170769147,5542380989283805407733,

%U 2053210330075493118514936,760624844506193044187974495

%N Number of nX4 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order

%C Column 4 of A233113

%H R. H. Hardin, <a href="/A233109/b233109.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 445*a(n-1) -29415*a(n-2) +684239*a(n-3) -6544703*a(n-4) +26009211*a(n-5) -37153497*a(n-6) +17033721*a(n-7)

%e Some solutions for n=2

%e ..0..1..5..4....0..1..2..4....0..1..2..5....0..1..2..2....0..1..2..5

%e ..2..5..4..2....1..5..2..5....4..3..0..3....1..0..1..2....3..5..4..5

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 04 2013

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