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A275086
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Number of nX4 0..2 arrays with no element equal to any value at offset (0,-2) (-1,-2) or (-2,-1) and new values introduced in order 0..2.
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1
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6, 96, 508, 3088, 18440, 111900, 675600, 4094240, 24794560, 150165020, 909361668, 5507667148, 33356744732, 202019640344, 1223500857956, 7410005643024, 44877800876060, 271796556988084, 1646101595999968, 9969411699754184
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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) = 3*a(n-1) +8*a(n-2) +46*a(n-3) +133*a(n-4) -64*a(n-5) -492*a(n-6) -520*a(n-7) +568*a(n-8) -1592*a(n-9) +1156*a(n-10) +1328*a(n-11) -4992*a(n-12) +1440*a(n-13) +3456*a(n-14) for n>15
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EXAMPLE
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Some solutions for n=4
..0..0..1..2. .0..0..1..2. .0..1..1..2. .0..1..1..0. .0..0..1..1
..0..0..1..1. .0..2..1..1. .0..1..1..0. .0..1..1..2. .1..0..2..1
..0..1..2..2. .0..1..1..0. .1..1..2..2. .1..1..2..2. .1..1..2..2
..0..1..1..0. .2..1..1..0. .2..2..0..0. .1..1..2..0. .0..2..2..0
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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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