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A275500
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Number of nX4 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,0) or (-1,-1) and new values introduced in order 0..2.
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1
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14, 324, 400, 656, 988, 2628, 7140, 19368, 52864, 144228, 394248, 1077956, 2947432, 8062396, 22050256, 60314412, 164976924, 451256880, 1234335036, 3376282048, 9235192524, 25261198432, 69097304872, 189003117812, 516983415672
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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) = a(n-1) +8*a(n-2) -28*a(n-4) -9*a(n-5) +55*a(n-6) +16*a(n-7) -70*a(n-8) -9*a(n-9) +56*a(n-10) -28*a(n-12) +a(n-13) +8*a(n-14) -a(n-16) for n>20
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EXAMPLE
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Some solutions for n=4
..0..0..0..1. .0..1..1..0. .0..0..1..2. .0..0..1..2. .0..0..1..2
..2..2..1..1. .1..2..0..0. .0..1..2..0. .0..1..2..2. .2..1..2..2
..2..1..1..2. .2..2..0..2. .1..1..2..0. .1..1..2..0. .1..1..2..0
..1..1..0..2. .0..0..1..1. .2..2..0..1. .2..2..0..0. .0..0..0..1
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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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