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1/24 of the number of (n+1) X 8 0..3 arrays with every 2 X 2 subblock containing exactly three distinct values.
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%I #6 Oct 01 2021 17:12:39

%S 3875968,6471298096,10588548225946,17377952662176322,

%T 28508855963437333072,46772256761288023913418

%N 1/24 of the number of (n+1) X 8 0..3 arrays with every 2 X 2 subblock containing exactly three distinct values.

%C Column 7 of A183594.

%e Some solutions with a(1,1) = 0 for 3 X 8

%e ..0..0..0..0..2..3..3..0....0..0..0..0..2..2..1..3....0..0..0..0..0..3..3..0

%e ..2..1..2..1..0..2..1..0....2..1..2..1..1..3..1..2....2..1..2..1..2..0..1..1

%e ..0..0..0..0..2..1..0..3....0..0..0..0..2..1..2..0....0..0..0..0..1..2..0..2

%Y Cf. A183594.

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 05 2011