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%I #4 Oct 30 2013 06:29:25
%S 144,1024,23104,394384,5475600,84052224,1326125056,20301690256,
%T 310824090256,4792596640000,73781640461376,1134353447066896,
%U 17451552419496976,268530609869169664,4131141192676642816
%N Number of (n+3)X(1+3) 0..3 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero
%C Column 1 of A230796
%H R. H. Hardin, <a href="/A230789/b230789.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 9*a(n-1) +43*a(n-2) +767*a(n-3) +2043*a(n-4) -9055*a(n-5) -43349*a(n-6) +219*a(n-7) +23245*a(n-8) -6325*a(n-9) +18361*a(n-10) -763*a(n-11) +2745*a(n-12) -213*a(n-13) -15*a(n-14) +a(n-15)
%e Some solutions for n=1
%e ..0..1..2..1....0..0..0..2....0..2..0..0....0..0..2..0....0..0..0..0
%e ..2..1..2..3....1..1..3..3....3..1..1..3....3..1..1..3....3..1..1..3
%e ..2..3..0..1....2..2..0..0....0..0..2..2....2..0..0..2....2..0..0..2
%e ..2..3..0..3....1..3..1..3....3..1..3..1....3..3..3..3....3..3..3..3
%K nonn
%O 1,1
%A _R. H. Hardin_, Oct 30 2013