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A237861 Number of (n+1)X(1+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1

%I

%S 81,336,1414,6030,25525,107272,453088,1919632,8117752,34231344,

%T 144659936,611705384,2586040156,10917301088,46143495072,194990974880,

%U 824264967728,3481115148416,14714216616096,62164050866784,262771277795472

%N Number of (n+1)X(1+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

%C Column 1 of A237868

%H R. H. Hardin, <a href="/A237861/b237861.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 252*a(n-4) +1304*a(n-6) -1908*a(n-8) -1312*a(n-10) +1280*a(n-12) -2304*a(n-14)

%e Some solutions for n=5

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 14 2014

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Last modified September 30 15:50 EDT 2022. Contains 357106 sequences. (Running on oeis4.)