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A208875
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Number of 4Xn 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors
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1
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15, 1979, 324682, 52947540, 8624977114, 1404920207834, 228847686794351, 37277070892199501, 6072074518379364073, 989082262060956074133, 161111942886719306980432, 26243578660069203997974518
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 222*a(n-1) -10949*a(n-2) +228692*a(n-3) -2273610*a(n-4) +10170544*a(n-5) -13839646*a(n-6) -45418980*a(n-7) +225253855*a(n-8) -439046430*a(n-9) +509809347*a(n-10) -407061936*a(n-11) +239595084*a(n-12) -96068592*a(n-13) +18662400*a(n-14) for n>16
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EXAMPLE
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Some solutions for n=4
..0..1..1..1....0..0..1..0....0..1..1..0....0..0..0..1....0..0..0..0
..0..0..0..1....2..2..1..1....0..0..2..0....1..1..2..0....1..1..1..0
..1..1..0..0....3..2..0..1....1..2..1..1....0..1..1..3....0..0..1..1
..0..1..1..1....0..3..3..1....3..1..0..0....3..0..3..1....1..0..0..2
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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