%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