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%I #5 Dec 18 2015 18:18:50
%S 2,20,1182,320314,471203608,3608789598890,144633234041629586,
%T 30422021680410630610470,33561342025910573963641656948
%N Number of n X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of the elements above it, modulo 4
%C Diagonal of A239649
%e Some solutions for n=3
%e ..1..0..0....1..0..0....1..3..3....3..0..0....3..0..0....3..0..0....1..0..3
%e ..1..3..1....2..1..0....2..3..2....2..1..1....2..0..3....2..3..3....1..0..0
%e ..3..0..2....3..2..0....3..2..2....1..2..1....2..3..0....2..0..0....3..1..2
%K nonn
%O 1,1
%A _R. H. Hardin_, Mar 23 2014