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Number of 2nX6 0..4 arrays with values 0..4 introduced in row major order and each element equal to an even number of horizontal and vertical neighbors.
0

%I #10 Feb 04 2023 05:30:36

%S 67442,163506788110,397739142470871040,967523967174230258261646,

%T 2353559236762243709633958950262

%N Number of 2nX6 0..4 arrays with values 0..4 introduced in row major order and each element equal to an even number of horizontal and vertical neighbors.

%C Column 3 of A198538.

%e Some solutions for n=2

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

%e ..0..1..0..3..4..1....0..1..0..2..3..0....0..1..0..2..4..2....0..1..0..3..4..3

%e ..0..0..0..1..0..4....0..0..0..3..1..4....0..0..0..1..2..0....0..0..0..1..2..1

%e ..1..2..1..4..1..2....1..2..1..2..4..2....1..2..1..3..4..1....1..2..1..3..0..2

%K nonn,more

%O 1,1

%A _R. H. Hardin_, Oct 26 2011