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A222831
Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order
1
6, 613, 114782, 23567385, 5026137016, 1093286140097, 240791286159691, 53509887603503644, 11973329684485913722, 2693909098107381431482, 608845475416039463267176, 138122543896575176671661121
OFFSET
1,1
COMMENTS
Column 4 of A222832
LINKS
EXAMPLE
Some solutions for n=3
..0..1..2..1....0..1..1..1....0..1..0..0....0..1..1..1....0..0..1..2
..1..3..2..0....2..1..0..3....2..3..3..0....1..2..1..0....2..3..0..2
..1..1..2..3....3..2..0..1....0..2..3..1....3..0..0..3....0..1..2..2
CROSSREFS
Sequence in context: A255886 A300389 A172899 * A206458 A265116 A132928
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 06 2013
STATUS
approved