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%I #4 Nov 25 2016 07:42:17
%S 504,2080575,2864009499,3014441325194,2738085955639984,
%T 2208684003726307854,1606277016357286546242,1064650757873104185361759,
%U 648100425195945762366583042,364419942118182508200030228710
%N Number of nX7 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes.
%C Column 7 of A278656.
%H R. H. Hardin, <a href="/A278655/b278655.txt">Table of n, a(n) for n = 1..19</a>
%e Some solutions for n=1
%e ..0..2..0..0..1..2..2. .1..2..2..1..2..1..2. .1..2..1..1..2..0..1
%Y Cf. A278656.
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 25 2016
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