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%I #9 Oct 02 2021 16:00:13
%S 7,225,20687,5115121,3382058727,5991606341393,28434309064956831,
%T 361537376127800203809,12315682423794584564506503,
%U 1123977764293133379867078361409
%N Number of (n+1) X (n+1) 0..2 arrays with every 2 X 2 subblock having one or three distinct values, and new values 0..2 introduced in row major order.
%C Diagonal of A210107.
%e Some solutions for n=4
%e ..0..0..0..1..1....0..0..0..0..0....0..0..1..2..0....0..0..1..2..2
%e ..0..0..0..2..0....0..0..0..0..0....1..2..2..0..1....2..1..2..0..1
%e ..0..0..0..1..2....1..2..1..2..1....2..0..1..2..2....1..0..1..1..2
%e ..1..2..1..2..0....2..0..0..1..0....2..1..2..0..1....1..2..0..2..0
%e ..0..0..0..2..1....0..1..2..0..2....2..0..0..1..2....1..0..1..1..2
%Y Cf. A210107.
%K nonn
%O 1,1
%A _R. H. Hardin_, Mar 17 2012
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