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A197436
Number of nX2 0..2 arrays with no element equal to the average of its horizontal and vertical neighbors
1
6, 34, 246, 1736, 12450, 89528, 644328, 4638654, 33398106, 240473126, 1731475912, 12467176650, 89767756044, 646357555524, 4653989082594, 33510269018262, 241285084850682, 1737332890742456, 12509374882010702, 90071661504230880
OFFSET
1,1
COMMENTS
Column 2 of A197442
LINKS
FORMULA
Empirical: a(n) = 7*a(n-1) +6*a(n-2) -25*a(n-3) -57*a(n-4) -7*a(n-5) +78*a(n-6) +71*a(n-7) +6*a(n-8) -18*a(n-9) -10*a(n-10) -8*a(n-11)
EXAMPLE
Some solutions for n=4
..1..0....1..0....2..2....0..1....2..0....0..2....1..0....1..2....0..2....0..2
..1..2....1..2....0..0....2..1....2..0....2..1....0..1....2..0....2..1....2..1
..2..1....2..0....0..1....0..1....0..1....1..1....0..1....2..1....0..2....2..1
..0..2....0..1....0..1....1..0....0..1....2..0....2..1....1..2....2..0....0..1
CROSSREFS
Sequence in context: A370324 A230331 A267242 * A334787 A302148 A218685
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 15 2011
STATUS
approved