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%I #8 Dec 18 2015 18:17:54
%S 1,15,16714,1084539825,1814002928583853,72341858272434900016248
%N Number of n X n 0..4 arrays with values 0..4 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors
%C Diagonal of A198528
%e Some solutions for n=4
%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
%e ..0..1..1..2....0..1..1..1....0..1..1..0....0..1..1..1....0..1..1..2
%e ..2..1..3..0....2..1..3..4....2..1..3..0....2..1..0..2....3..0..0..3
%e ..1..2..1..0....1..3..4..0....3..0..0..0....2..0..0..2....3..4..0..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Oct 26 2011
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