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A268014
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Number of n X 2 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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4
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9, 81, 729, 6084, 49284, 386884, 2965284, 22268961, 164378041, 1195430625, 8581613769, 60904316944, 427872974400, 2978730810000, 20567785069584, 140966727989481, 959632952511249, 6492348190361881, 43674091151207841
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OFFSET
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1,1
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COMMENTS
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Column 2 of A268019.
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = 25*a(n-1) -225*a(n-2) +745*a(n-3) +475*a(n-4) -6275*a(n-5) -885*a(n-6) +22525*a(n-7) +22525*a(n-8) -885*a(n-9) -6275*a(n-10) +475*a(n-11) +745*a(n-12) -225*a(n-13) +25*a(n-14) -a(n-15).
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EXAMPLE
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Some solutions for n=5
..1..1....0..2....2..1....1..1....1..1....1..0....0..2....1..0....1..0....2..1
..2..2....0..2....2..2....0..1....2..2....0..0....2..2....0..0....2..0....0..0
..0..1....1..0....2..0....1..1....1..1....2..2....0..1....1..0....0..1....0..2
..1..0....2..1....1..0....1..1....0..1....0..2....1..2....1..2....2..2....0..1
..0..2....2..0....2..0....2..0....1..0....1..2....0..0....0..0....2..0....0..2
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CROSSREFS
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Cf. A268019.
Sequence in context: A174108 A254435 A267790 * A228972 A125947 A120997
Adjacent sequences: A268011 A268012 A268013 * A268015 A268016 A268017
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Jan 24 2016
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STATUS
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approved
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