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%I #4 Oct 16 2015 07:27:23
%S 1,2,82,24711,84790557,2535097569590
%N Number of (n+1)X(n+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 Diagonal of A263373.
%e Some solutions for n=4
%e ..1..2..0..1..2....2..0..0..2..0....0..1..1..2..0....0..0..1..1..2
%e ..2..0..2..0..2....1..2..2..2..2....2..1..0..2..1....0..2..0..0..2
%e ..0..1..2..1..1....0..2..1..0..0....2..2..1..2..0....1..2..2..2..2
%e ..1..1..1..0..2....2..1..0..0..0....1..0..0..1..0....1..1..2..2..1
%e ..2..1..2..1..0....1..2..0..1..2....2..0..1..1..1....2..2..0..0..1
%Y Cf. A263373.
%K nonn
%O 1,2
%A _R. H. Hardin_, Oct 16 2015