%I #4 Nov 28 2016 11:05:40
%S 2128,4888659,7804657491,11262497170744,14688350983557860,
%T 17132175867394310218,17905720402390042972393,
%U 16929268110709399178933670,14654548270532478576848465454,11752173813052078583219415650082
%N Number of nX6 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.
%C Column 6 of A278798.
%H R. H. Hardin, <a href="/A278797/b278797.txt">Table of n, a(n) for n = 1..18</a>
%e Some solutions for n=1
%e ..3..1..3..3..0..1. .3..0..0..3..0..1. .0..1..1..0..3..0. .0..3..0..2..2..2
%Y Cf. A278798.
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 28 2016