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%I #5 Mar 31 2012 12:36:35
%S 2,34,2027,232841,34003792,5315840795,846047363854,135284283124811,
%T 21658679381667910,3468618095206638077,555543217744635684040,
%U 88979288917879960297469,14251565534424509235823960
%N Number of nX3 0..6 arrays with values 0..6 introduced in row major order and no element equal to any horizontal or vertical neighbor
%C Column 3 of A198723
%H R. H. Hardin, <a href="/A198718/b198718.txt">Table of n, a(n) for n = 1..200</a>
%F Empirical: a(n) = 234*a(n-1) -13497*a(n-2) +283640*a(n-3) -2626919*a(n-4) +12277210*a(n-5) -30282843*a(n-6) +38629620*a(n-7) -23115780*a(n-8) +4848336*a(n-9)
%e Some solutions with all values 0 to 6 for n=4
%e ..0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..0....0..1..2
%e ..3..0..4....3..0..3....3..4..3....3..2..0....3..4..5....2..3..4....3..4..5
%e ..5..3..5....4..5..2....4..5..6....4..5..3....5..6..4....1..0..5....4..6..4
%e ..2..6..2....2..0..6....5..1..5....1..6..0....0..5..1....6..2..4....3..4..6
%K nonn
%O 1,1
%A _R. H. Hardin_ Oct 29 2011
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