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%I #4 Dec 25 2014 13:47:43
%S 829,4315,24001,136697,782043,4486592,25761550,147992920,850428880,
%T 4887217447,28087368243,161429119593,927805560543,5332571698228,
%U 30649308232987,176159289551676,1012491331650746,5819396661500005
%N Number of (n+2)X(2+2) 0..2 arrays with every consecutive three elements in every row and column having exactly 2 distinct values, in every diagonal 1 or 2 distinct values, in every antidiagonal 2 or 3 distinct values, and new values 0 upwards introduced in row major order
%C Column 2 of A252993
%H R. H. Hardin, <a href="/A252988/b252988.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..0..1..0..0....0..0..1..0....0..1..0..0....0..0..1..0....0..0..1..0
%e ..0..2..2..1....1..0..0..1....0..2..0..0....2..1..1..0....0..0..2..2
%e ..1..1..0..1....0..1..1..0....1..1..2..1....2..0..0..1....2..2..1..2
%e ..0..1..0..0....0..0..1..1....1..1..0..0....1..1..0..0....0..2..2..0
%e ..0..0..2..0....2..1..2..1....0..2..2..0....2..0..2..0....0..1..1..0
%e ..1..1..0..1....2..1..1..0....1..1..2..1....1..1..0..1....2..2..1..2
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 25 2014
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