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%I #5 Dec 18 2015 18:18:48
%S 2,4,40,284,11440,296384,43248968,4105077596,2157995166344,
%T 751193181802392,1429330959153482960,1827061855695075169856
%N Number of n X n 0..2 arrays with no element equal to the sum modulo 3 of elements to its left or elements above it
%C Diagonal of A238726
%e Some solutions for n=5
%e ..2..1..2..1..2....2..1..1..2..1....2..1..2..1..1....2..1..1..2..2
%e ..1..0..0..2..1....1..0..0..0..2....1..0..0..0..2....1..2..2..0..0
%e ..2..0..1..1..2....2..0..0..1..2....2..0..1..2..1....1..2..2..0..0
%e ..1..0..2..2..1....1..0..2..2..0....1..0..2..1..2....2..1..1..0..0
%e ..2..0..0..1..1....1..2..2..0..0....2..0..1..2..1....2..1..1..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_, Mar 03 2014
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