%I #10 Jun 10 2018 20:47:26
%S 2592,55296,1180224,25190406,537665796,11475976536,244944162648,
%T 5228107832664,111589154041536,2381767878219264,50836645164242304,
%U 1085061443303739744,23159638720382882112,494321191641967752576
%N Number of (n+2) X 3 0..2 arrays with no 3 X 3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..2 introduced in row major order.
%C Column 1 of A204782.
%H R. H. Hardin, <a href="/A204775/b204775.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 22*a(n-1) - 308*a(n-3) + 196*a(n-4).
%F Empirical g.f.: 54*x*(48 - 32*x - 672*x^2 + 441*x^3) / ((1 - 22*x + 14*x^2)*(1 - 14*x^2)). - _Colin Barker_, Jun 10 2018
%e Some solutions for n=3:
%e 0 0 0 0 0 1 0 1 1 0 1 2 0 0 1 0 0 0 0 1 0
%e 1 0 0 2 0 2 0 1 2 1 0 2 2 2 0 0 0 0 0 1 1
%e 2 1 1 2 2 1 2 1 2 2 0 1 0 0 2 1 1 2 1 0 2
%e 2 0 0 0 2 1 0 0 1 2 1 0 1 0 0 1 2 1 1 2 2
%e 1 2 2 2 0 1 0 2 0 2 2 2 0 2 2 0 2 1 0 1 1
%Y Cf. A204782.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 19 2012