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A198719
Number of nX4 0..6 arrays with values 0..6 introduced in row major order and no element equal to any horizontal or vertical neighbor
2
5, 499, 232841, 173549032, 141168480719, 116492275674072, 96356630422085931, 79732515488691835557, 65980773070548173552412, 54601426682639992758644080, 45184694908666112938858073903, 37392013011256643009627621268829
OFFSET
1,1
COMMENTS
Column 4 of A198723
LINKS
FORMULA
Empirical: a(n) = 1081*a(n-1) -231028*a(n-2) +18466747*a(n-3) -729356901*a(n-4) +16017483310*a(n-5) -207602672167*a(n-6) +1633653422655*a(n-7) -7862297151184*a(n-8) +22902587520657*a(n-9) -39383752489643*a(n-10) +38480449661142*a(n-11) -19517387256516*a(n-12) +3939042601848*a(n-13)
EXAMPLE
Some solutions with all values 0 to 6 for n=5
..0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1
..1..0..1..0....1..0..1..0....1..0..1..0....1..0..1..0....1..0..1..0
..0..2..0..1....2..1..0..1....2..3..0..1....2..3..0..1....2..3..0..1
..3..4..1..4....1..0..3..4....4..5..6..3....4..5..4..5....1..0..4..2
..5..6..4..0....5..4..0..6....6..0..4..0....0..4..6..1....4..5..3..6
CROSSREFS
Sequence in context: A152513 A012822 A124358 * A198910 A207866 A013305
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 29 2011
STATUS
approved