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%I #4 Sep 04 2012 10:53:45
%S 2,10,52,726,12840,373780,12297870,580853761,29562890980,
%T 2004648246554,142953068558998,12954739605661928,1216988850964527370,
%U 140585911310155419266,16679506383419809650408,2374936932537133281235971
%N Number of horizontal and antidiagonal neighbor colorings of the even squares of a 4Xn array with new integer colors introduced in row major order
%C Row 4 of A216338
%H R. H. Hardin, <a href="/A216340/b216340.txt">Table of n, a(n) for n = 1..19</a>
%e Some solutions for n=4
%e ..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x
%e ..x..2..x..3....x..2..x..3....x..2..x..3....x..0..x..1....x..2..x..3
%e ..4..x..0..x....4..x..5..x....3..x..1..x....2..x..3..x....0..x..2..x
%e ..x..5..x..3....x..3..x..0....x..3..x..1....x..2..x..1....x..0..x..4
%K nonn
%O 1,1
%A _R. H. Hardin_ Sep 04 2012
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