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%I #6 Apr 21 2020 12:51:24
%S 0,32,4558,2360544,6345491150,100825279690194,10174217016822816668,
%T 6850575319751106211878878
%N Number of n X n 0..2 arrays with rows and columns in lexicographic nondecreasing order but with exactly one mistake.
%C Diagonal of A278309.
%e Some solutions for n=3
%e ..1..2..1. .1..2..2. .1..2..2. .1..1..0. .0..0..1. .0..1..0. .0..0..0
%e ..2..0..0. .0..0..2. .2..1..2. .1..2..0. .1..0..1. .1..1..2. .1..0..2
%e ..2..0..2. .2..0..1. .0..1..0. .1..2..0. .2..0..1. .1..2..0. .1..1..1
%Y Cf. A278309.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 17 2016
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