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Number of nX2 0..2 arrays with adjacent row and column sums unequal
1

%I #6 Mar 31 2012 12:36:53

%S 6,52,352,2444,17508,124340,872940,6112832,42822036,299718840,

%T 2094967284,14630909636,102130256404,712606093984,4970091031972,

%U 34652009741528,241529705097892,1683093292484152,11726099598816180,81680440933444532

%N Number of nX2 0..2 arrays with adjacent row and column sums unequal

%C Column 2 of A202931

%H R. H. Hardin, <a href="/A202925/b202925.txt">Table of n, a(n) for n = 1..187</a>

%e Some solutions for n=4

%e ..2..2....2..1....2..0....1..0....1..0....1..1....0..1....1..1....2..2....2..0

%e ..1..0....0..0....1..0....2..1....0..2....1..0....2..2....0..1....2..0....1..0

%e ..0..0....2..0....0..0....0..1....1..2....1..1....1..2....1..2....0..0....1..1

%e ..2..0....0..1....0..1....0..0....0..1....1..0....0..0....0..0....0..1....2..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 26 2011