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A184468 1/6 the number of (n+2)X(n+2) 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last.

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%I A184468 #7 Jul 22 2025 09:35:10
%S A184468 315,2755,14119,53739,247879,904411,2909367
%N A184468 1/6 the number of (n+2)X(n+2) 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last.
%C A184468 Diagonal of A184477
%e A184468 Some solutions with a(1,1)=0 for 4X4
%e A184468 ..0..2..1..0....0..2..1..0....0..1..2..0....0..0..1..1....0..2..1..0
%e A184468 ..0..0..0..0....1..1..2..2....0..0..1..1....1..0..0..0....1..1..2..1
%e A184468 ..1..1..1..1....2..2..1..1....1..0..1..0....1..2..1..1....1..2..2..1
%e A184468 ..0..1..2..0....1..0..2..1....2..0..1..2....0..0..1..1....1..2..0..1
%K A184468 nonn
%O A184468 1,1
%A A184468 _R. H. Hardin_ Jan 15 2011

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