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A237967 Number of (n+1)X(1+1) 0..3 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1

%I

%S 256,1494,7905,40442,208210,1074202,5540337,28475040,146747184,

%T 755218808,3893371264,20027524168,103232219796,531114565248,

%U 2737826075360,14084875246240,72603362037280,373519603204256,1925412625288848

%N Number of (n+1)X(1+1) 0..3 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

%C Column 1 of A237974

%H R. H. Hardin, <a href="/A237967/b237967.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 488*a(n-4) +5140*a(n-6) +14624*a(n-8) +12288*a(n-10) for n>13

%e Some solutions for n=4

%e ..3..0....0..3....2..1....2..1....2..0....3..3....3..2....2..2....3..2....3..0

%e ..2..3....1..3....1..0....0..3....3..2....3..2....3..2....3..1....0..1....0..0

%e ..2..1....2..1....0..0....3..2....3..0....1..1....1..0....0..0....0..2....1..2

%e ..1..0....1..1....2..1....1..2....2..0....0..0....0..3....3..2....0..0....3..1

%e ..2..2....2..3....1..3....1..0....3..3....0..1....0..0....3..0....1..3....0..0

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 16 2014

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Last modified October 4 18:32 EDT 2022. Contains 357239 sequences. (Running on oeis4.)