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%I #4 Nov 24 2013 07:27:44
%S 15,3015,187989,12521603,865692227,59192688269,4047993038079,
%T 276984506979883,18950464526945069,1296525832007000487,
%U 88704539492832641819,6068900612790047496325,415216038771799950697787
%N Number of nX4 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally, vertically, diagonally or antidiagonally
%C Column 4 of A232459
%H R. H. Hardin, <a href="/A232455/b232455.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 51*a(n-1) +885*a(n-2) +20314*a(n-3) +51242*a(n-4) -287165*a(n-5) -7238521*a(n-6) -20969007*a(n-7) -20079258*a(n-8) +379758092*a(n-9) +987349124*a(n-10) +1940213292*a(n-11) -3615001480*a(n-12) -3551344432*a(n-13) +653913792*a(n-14) +2673844992*a(n-15)
%e Some solutions for n=3
%e ..1..0..2..2....1..2..2..1....1..2..1..0....0..0..2..1....1..2..1..2
%e ..0..2..0..0....1..0..1..2....2..0..0..0....1..0..2..2....0..1..2..1
%e ..2..2..2..1....1..2..1..0....0..1..2..1....2..2..1..1....2..1..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 24 2013
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