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%I #4 Nov 22 2016 06:55:20
%S 1128,1287838,1796061464,2266913897519,2573951428892959,
%T 2817080307689646420,3058351651772615415451,3218514217113422076011068,
%U 3172598007779111848619027479,2870266355084730530696055472589
%N Number of nX6 0..3 arrays with rows and columns in lexicographic nondecreasing order but with exactly one mistake.
%C Column 6 of A278435.
%H R. H. Hardin, <a href="/A278434/b278434.txt">Table of n, a(n) for n = 1..18</a>
%e Some solutions for n=1
%e ..0..1..2..3..1..3. .0..2..2..0..2..2. .3..3..1..1..1..3. .1..1..1..2..1..1
%Y Cf. A278435.
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 22 2016
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