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%I #4 Jan 25 2016 11:00:59
%S 1,64,10438,2796826,915745002,322124540754,116124404018058,
%T 42209510913723266,15385058360607977882,5612935794998414602514,
%U 2048403161005485984441578,747628311641175955079078306
%N Number of nX7 0..2 arrays with new values introduced in each row and column in sequential order starting with zero.
%C Column 7 of A268056.
%H R. H. Hardin, <a href="/A268055/b268055.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 549*a(n-1) -75693*a(n-2) +3237331*a(n-3) -45379926*a(n-4) +206208420*a(n-5) -255602200*a(n-6)
%e Some solutions for n=3
%e ..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..0
%e ..0..1..0..1..0..1..1....0..1..1..1..0..1..1....0..1..1..1..1..0..1
%e ..0..1..0..2..0..0..2....0..1..0..2..1..0..2....0..1..2..1..1..1..0
%Y Cf. A268056.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 25 2016