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A203456 Number of nX4 0..2 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 1

%I

%S 1,22,543,8837,143936,2527020,44974778,799146435,14222292590,

%T 253497958735,4520112095307,80604855648245,1437506215952323,

%U 25637856292628890,457259186435170066,8155419408921364692

%N Number of nX4 0..2 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

%C Column 4 of A203460

%H R. H. Hardin, <a href="/A203456/b203456.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 02 2012

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Last modified October 28 07:11 EDT 2021. Contains 348320 sequences. (Running on oeis4.)