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A208320
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Number of nX6 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors
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1
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122, 74164, 45806048, 28269518640, 17447625342768, 10768439015566880, 6646136838761770080, 4101906889966246046656, 2531642149413205778426624, 1562495723122773848862609024, 964351492313036003827665859200
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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) = 537*a(n-1) +49592*a(n-2) +31826*a(n-3) -58803472*a(n-4) +179637996*a(n-5) +25002428576*a(n-6) -374089290720*a(n-7) +1673162178864*a(n-8) +1458727001312*a(n-9) -26670663438976*a(n-10) +22320866668800*a(n-11) +163473207070720*a(n-12) -154760782270464*a(n-13) -553868665028608*a(n-14) +195352269029376*a(n-15) +950302465851392*a(n-16) +420741501681664*a(n-17) -139097129615360*a(n-18) -88593968136192*a(n-19) +5745055629312*a(n-20) +4232690270208*a(n-21) for n>22
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EXAMPLE
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Some solutions for n=4
..0..0..1..2..1..1....0..0..1..1..2..1....0..0..1..2..0..2....0..0..0..1..1..2
..1..1..2..0..1..2....0..1..1..2..2..2....1..0..2..1..2..1....2..1..2..0..1..1
..2..1..1..1..1..2....1..0..0..0..0..1....2..2..1..2..0..2....2..1..1..0..1..2
..1..2..2..2..0..1....2..1..0..1..2..0....2..0..0..0..2..1....0..1..2..2..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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