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%I #6 Dec 18 2015 18:17:54
%S 0,3,132,125468,839006010,44832664800117
%N Number of n X n 0..3 arrays with values 0..3 introduced in row major order and each element equal to one or two horizontal and vertical neighbors
%C Diagonal of A199149
%e Some solutions for n=4
%e ..0..0..1..1....0..0..1..1....0..0..1..1....0..1..1..1....0..0..1..1
%e ..1..1..0..0....2..2..3..3....1..1..1..0....0..0..2..2....2..3..3..0
%e ..2..2..0..3....2..2..0..0....2..0..0..0....2..2..3..2....2..0..0..0
%e ..0..0..3..3....0..0..2..2....2..2..2..2....1..1..3..2....3..3..3..3
%K nonn
%O 1,2
%A _R. H. Hardin_ Nov 03 2011
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