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A222669
Number of nX4 0..2 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order
1
3, 9, 40, 348, 2370, 20606, 212842, 2134959, 21085549, 211716164, 2136631932, 21522095442, 217024139551, 2193065402495, 22187387560680, 224679112979344, 2277631748750522, 23112487299379689, 234748284433308243
OFFSET
1,1
COMMENTS
Column 4 of A222673
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0..0....0..0..0..0....0..1..1..1....0..0..0..0....0..1..1..1
..1..0..0..0....1..0..0..0....1..1..1..1....0..0..0..0....1..1..1..1
..0..0..0..0....2..0..0..0....1..1..1..2....1..1..0..0....0..1..1..1
CROSSREFS
Sequence in context: A346753 A233533 A190341 * A179088 A027893 A018417
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 28 2013
STATUS
approved