%I #5 Mar 31 2012 12:37:25
%S 15,1979,324682,52947540,8624977114,1404920207834,228847686794351,
%T 37277070892199501,6072074518379364073,989082262060956074133,
%U 161111942886719306980432,26243578660069203997974518
%N Number of 4Xn 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors
%C Row 4 of A208872
%H R. H. Hardin, <a href="/A208875/b208875.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 222*a(n-1) -10949*a(n-2) +228692*a(n-3) -2273610*a(n-4) +10170544*a(n-5) -13839646*a(n-6) -45418980*a(n-7) +225253855*a(n-8) -439046430*a(n-9) +509809347*a(n-10) -407061936*a(n-11) +239595084*a(n-12) -96068592*a(n-13) +18662400*a(n-14) for n>16
%e Some solutions for n=4
%e ..0..1..1..1....0..0..1..0....0..1..1..0....0..0..0..1....0..0..0..0
%e ..0..0..0..1....2..2..1..1....0..0..2..0....1..1..2..0....1..1..1..0
%e ..1..1..0..0....3..2..0..1....1..2..1..1....0..1..1..3....0..0..1..1
%e ..0..1..1..1....0..3..3..1....3..1..0..0....3..0..3..1....1..0..0..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 02 2012
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