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%I #9 Apr 14 2015 08:33:28
%S 53,31541,209636605,15624102535570,13038188765075658693,
%T 121880956287359200992546463
%N 1/4 the number of (n+1) X (n+1) 0..3 arrays with no 2 X 2 subblock having sum 6.
%C Diagonal of A183802.
%e Some solutions for 3 X 3:
%e ..2..2..0....1..0..3....1..2..0....0..0..2....2..1..3....0..1..0....2..3..3
%e ..2..1..1....2..2..3....0..1..1....3..2..1....3..3..1....1..0..1....3..3..2
%e ..3..3..3....3..0..2....1..3..0....3..2..3....3..1..3....0..1..2....2..3..1
%Y Cf. A183802.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 07 2011
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