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%I #5 Feb 17 2014 08:28:08
%S 256,1760,12352,87488,618752,4375552,30949952,218919168,1548259072,
%T 10950274048,77458464768,547885305856,3874795835392,27405049921536,
%U 193853940023296,1371182905425920,9697383186169856,68586135474405376
%N Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the minimum minus the upper median minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
%C Column 1 of A238054
%H R. H. Hardin, <a href="/A238049/b238049.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 2528*a(n-4) -63488*a(n-8) +315392*a(n-12) +147456*a(n-16) +4194304*a(n-20) for n>21
%e Some solutions for n=4
%e ..1..0....3..0....3..0....2..2....0..2....3..3....2..3....0..2....3..0....1..0
%e ..3..3....2..1....0..1....0..0....0..0....1..1....0..0....2..3....1..3....2..2
%e ..0..2....0..0....3..1....2..1....2..1....0..3....3..1....0..1....1..3....3..3
%e ..3..2....1..1....0..0....0..3....1..0....1..2....1..2....2..0....0..3....1..2
%e ..3..2....1..2....1..2....1..1....3..3....0..2....1..0....3..1....3..2....3..0
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 17 2014
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