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%I #7 Dec 18 2015 18:17:58
%S 1,9,206,25087,12450511,27758308569,268596415269518,
%T 11418407989258386063,2123416290057435139377984,
%U 1730027601945756966270290770899,6171982920189881996353564499776171963
%N Number of n X n 0..2 arrays with every 1 immediately preceded by 0 to the left or above, and every 2 immediately preceded by both a 1 and a 0
%C Diagonal of A203371
%H R. H. Hardin, <a href="/A203364/b203364.txt">Table of n, a(n) for n = 1..15</a>
%e Some solutions for n=4
%e ..0..0..0..0....0..0..1..0....0..0..1..0....0..0..0..1....0..0..0..0
%e ..1..2..0..0....0..1..0..0....0..0..2..0....0..0..1..0....0..1..2..0
%e ..0..0..1..1....1..0..1..0....0..0..0..1....0..0..1..1....1..0..0..0
%e ..1..2..0..1....0..1..0..0....0..1..2..0....0..0..0..1....0..1..1..2
%K nonn
%O 1,2
%A _R. H. Hardin_ Dec 31 2011
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