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A268015
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Number of nX3 0..2 arrays with every repeated value in every row and column greater than or equal to the previous repeated value.
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1
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27, 729, 19683, 474552, 10941048, 240641848, 5106219048, 105087226959, 2107490863661, 41332013859375, 794974954718853, 15030454569975872, 279880270014528000, 5140991504979000000, 93278442949595408448
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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) = 84*a(n-1) -2814*a(n-2) +45276*a(n-3) -285019*a(n-4) -1063944*a(n-5) +20124468*a(n-6) -1605816*a(n-7) -630123753*a(n-8) -402925572*a(n-9) +10392502302*a(n-10) +30566899188*a(n-11) +12457260613*a(n-12) -49186967088*a(n-13) -30986023080*a(n-14) +49186967088*a(n-15) +12457260613*a(n-16) -30566899188*a(n-17) +10392502302*a(n-18) +402925572*a(n-19) -630123753*a(n-20) +1605816*a(n-21) +20124468*a(n-22) +1063944*a(n-23) -285019*a(n-24) -45276*a(n-25) -2814*a(n-26) -84*a(n-27) -a(n-28)
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EXAMPLE
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Some solutions for n=3
..2..0..2....2..0..2....2..2..0....0..0..2....1..1..0....0..2..0....2..0..2
..0..0..2....1..0..2....2..0..1....2..2..0....0..1..2....2..1..1....0..2..2
..1..2..0....0..1..2....1..0..2....0..0..0....0..2..0....1..2..0....2..1..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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