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A275230 Number of 5 X n 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,0) and new values introduced in order 0..2.

%I A275230 #7 Feb 02 2019 10:51:45
%S A275230 8,66,648,6448,64248,640250,6380362,63583084,633633188,6314431394,
%T A275230 62926066122,627085726484,6249183090572,62275838294858,
%U A275230 620605922265106,6184609012036812,61632329405048644,614193075180580914
%N A275230 Number of 5 X n 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,0) and new values introduced in order 0..2.
%H A275230 R. H. Hardin, <a href="/A275230/b275230.txt">Table of n, a(n) for n = 1..210</a>
%F A275230 Empirical: a(n) = 11*a(n-1) - 9*a(n-2) - 15*a(n-3) + 20*a(n-4) - 6*a(n-5) for n>6.
%F A275230 Empirical g.f.: 2*x*(4 - 11*x - 3*x^2 + 17*x^3 - 9*x^4 + x^5) / ((1 - x)*(1 - 10*x - x^2 + 14*x^3 - 6*x^4)). - _Colin Barker_, Feb 02 2019
%e A275230 Some solutions for n=4:
%e A275230 ..0..1..2..0. .0..0..1..2. .0..1..0..1. .0..1..0..2. .0..1..2..1
%e A275230 ..1..2..1..2. .2..1..0..1. .1..0..1..0. .1..0..1..0. .1..2..1..2
%e A275230 ..0..1..2..0. .1..2..1..2. .0..2..0..1. .0..1..0..2. .2..1..0..1
%e A275230 ..1..2..0..2. .2..1..2..1. .2..0..1..2. .1..0..1..0. .1..2..1..2
%e A275230 ..0..1..2..0. .1..0..1..2. .1..2..0..1. .0..2..0..2. .2..1..2..1
%Y A275230 Row 5 of A275228.
%K A275230 nonn
%O A275230 1,1
%A A275230 _R. H. Hardin_, Jul 20 2016