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%I #7 Jun 26 2022 05:34:31
%S 81,14178,18257013,167339492229,10892264636400698
%N Number of (n+1) X (n+1) 0..2 arrays with no 2 X 2 subblock commuting with any of its horizontal and vertical 2 X 2 subblock neighbors.
%C Diagonal of A187441.
%e Some solutions for 3 X 3
%e ..1..1..0....1..1..2....1..1..0....2..0..2....1..0..0....1..0..1....2..1..0
%e ..1..2..0....2..1..0....1..2..2....1..1..1....2..1..2....1..1..0....1..1..0
%e ..2..0..1....1..1..1....1..1..1....1..0..1....2..2..2....0..2..2....1..2..2
%Y Cf. A187441.
%K nonn
%O 1,1
%A _R. H. Hardin_, Mar 10 2011
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