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%I #4 Dec 21 2014 12:06:37
%S 1028,4717,23114,121043,649951,3523216,19170149,104987624,576681145,
%T 3171047173,17490297027,96593843143,533791409154,2954525292098,
%U 16363224352613,90662353009326,502747340040879,2788709900040761
%N Number of (n+2)X(2+2) 0..3 arrays with every consecutive three elements in every row, column and nw-se diagonal having exactly two distinct values, and new values 0 upwards introduced in row major order
%C Column 2 of A252777
%H R. H. Hardin, <a href="/A252772/b252772.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..0..1..1..0....0..0..1..0....0..1..0..1....0..0..1..0....0..1..1..2
%e ..0..2..2..1....0..0..2..2....0..2..2..3....1..1..0..1....0..1..0..1
%e ..2..1..2..1....2..3..2..2....1..1..2..1....1..0..0..1....3..0..0..1
%e ..0..1..1..0....0..3..3..0....1..2..1..1....0..0..1..0....0..0..3..0
%e ..0..2..2..0....2..0..2..0....2..1..1..2....0..1..0..0....0..3..0..0
%e ..2..1..2..2....2..3..2..3....2..1..2..1....2..0..0..1....1..3..3..1
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 21 2014