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%I #4 Nov 06 2013 18:33:03
%S 0,0,66,1170,34786,1083188,31513702,918670552,26923332502,
%T 788665534214,23096502615266,676415379783970,19810153530144730,
%U 580179175498127842,16991673670981870826,497634173760064848450,14574184574564194067466
%N Number of 4Xn 0..3 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero
%C Row 4 of A231285
%H R. H. Hardin, <a href="/A231287/b231287.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=3
%e ..0..1..0....0..1..2....0..1..2....0..1..0....0..1..0....0..1..0....0..1..2
%e ..2..3..2....2..3..2....0..3..1....2..3..2....2..3..2....2..3..2....2..3..0
%e ..2..1..0....0..1..2....2..2..1....0..1..2....2..1..0....2..2..3....2..1..2
%e ..0..3..2....0..3..2....3..0..3....0..3..2....2..3..2....1..0..3....0..3..2
%K nonn
%O 1,3
%A _R. H. Hardin_, Nov 06 2013