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A238174 Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the minimum of every 2X2 subblock equal 1

%I

%S 423,5321,69023,938601,12951743,180345769,2520461647,35289713177,

%T 494500172559,6931846504281,97186455651295,1362689160952841,

%U 19107483153243615,267927527528514313,3756941779561193327

%N Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the minimum of every 2X2 subblock equal

%C Column 2 of A238180

%H R. H. Hardin, <a href="/A238174/b238174.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 22*a(n-1) -111*a(n-2) -106*a(n-3) +1473*a(n-4) -2198*a(n-5) -121*a(n-6) +1514*a(n-7) -472*a(n-8)

%e Some solutions for n=3

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 19 2014

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Last modified May 23 18:08 EDT 2022. Contains 353993 sequences. (Running on oeis4.)