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 A236791 Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the upper median plus the minimum of every 2X2 subblock equal 1

%I

%S 81,255,825,2817,9717,34317,122305,442285,1612085,5935493,21990145,

%T 82051485,307574133,1158698629,4379531169,16610367645,63145291189,

%U 240620562981,918393173569,3511019670621,13437773070709,51488379790533

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

%C Column 1 of A236798

%H R. H. Hardin, <a href="/A236791/b236791.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 8*a(n-1) +8*a(n-2) -204*a(n-3) +224*a(n-4) +1972*a(n-5) -3810*a(n-6) -9220*a(n-7) +24389*a(n-8) +20868*a(n-9) -81294*a(n-10) -13536*a(n-11) +150316*a(n-12) -33360*a(n-13) -148072*a(n-14) +72384*a(n-15) +63616*a(n-16) -48128*a(n-17) -2816*a(n-18) +8192*a(n-19) -1536*a(n-20)

%e Some solutions for n=5

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 31 2014

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Last modified January 23 21:44 EST 2022. Contains 350515 sequences. (Running on oeis4.)