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A238720 Number of nX2 0..2 arrays with no element equal to the sum modulo 3 of elements to its left or elements above it 1

%I #4 Mar 03 2014 16:06:29

%S 2,4,10,16,42,64,170,256,682,1024,2730,4096,10922,16384,43690,65536,

%T 174762,262144,699050,1048576,2796202,4194304,11184810,16777216,

%U 44739242,67108864,178956970,268435456,715827882,1073741824,2863311530,4294967296

%N Number of nX2 0..2 arrays with no element equal to the sum modulo 3 of elements to its left or elements above it

%C Column 2 of A238726

%H R. H. Hardin, <a href="/A238720/b238720.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 5*a(n-2) -4*a(n-4)

%e Some solutions for n=5

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 03 2014

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