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%I #4 Feb 17 2014 11:39:52
%S 256,16116,2296588,506608980,323819924384,448255641499780,
%T 1736639229342029538,13883769406039825746192
%N Number of (n+1)X(n+1) 0..3 arrays with the maximum minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
%C Diagonal of A238072
%e Some solutions for n=2
%e ..1..3..0....3..3..0....3..0..0....2..3..1....3..1..3....2..1..1....2..1..3
%e ..3..1..1....1..1..2....0..1..2....1..2..0....0..2..2....3..2..1....2..1..3
%e ..0..2..3....1..2..3....2..1..1....2..2..1....2..1..1....3..2..3....0..0..3
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 17 2014
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