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%I #4 Nov 21 2016 09:07:47
%S 15,2550,201539,11454780,514122657,20086951472,724313811311,
%T 24378309172117,757386980723842,21490393664858691,555075804780316188,
%U 13082453926050947533,282833107470851109743,5643469565485557711688
%N Number of nX4 0..2 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.
%C Column 4 of A278414.
%H R. H. Hardin, <a href="/A278410/b278410.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=2
%e ..0..2..0..0. .2..1..2..2. .2..1..0..0. .0..2..2..1. .2..2..0..1
%e ..0..1..2..2. .2..0..0..2. .2..1..0..0. .1..2..1..2. .2..2..0..0
%Y Cf. A278414.
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 21 2016
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