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%I #4 Oct 16 2015 07:30:34
%S 2,7,82,865,9888,107514,1260442,15048493,180640864,2167406803,
%T 26004426192,311958557356,3743219626994,44918305209517,
%U 539021844275470,6468267502547329,77619174191856096,931428840572850954
%N Number of (n+1)X(3+1) 0..2 arrays with each row and column divisible by 7, read as a base-3 number with top and left being the most significant digits.
%C Column 3 of A263373.
%H R. H. Hardin, <a href="/A263368/b263368.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..1..2..1..1....2..2..1..2....0..0..0..0....0..0..2..1....2..1..2..1
%e ..2..2..1..2....0..0..0..0....1..0..2..2....0..2..1..0....1..2..1..1
%e ..1..0..0..1....1..2..1..1....0..0..0..0....2..0..0..2....1..0..0..1
%e ..1..2..1..1....1..0..0..1....0..0..0..0....1..0..2..2....1..1..2..0
%e ..0..2..1..0....1..2..1..1....1..0..2..2....0..2..1..0....2..2..1..2
%Y Cf. A263373.
%K nonn
%O 1,1
%A _R. H. Hardin_, Oct 16 2015