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A265419
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Number of nX2 arrays containing 2 copies of 0..n-1 with no equal horizontal, vertical, diagonal or antidiagonal neighbors and new values introduced sequentially from 0.
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0
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0, 0, 0, 4, 48, 584, 8096, 127296, 2241856, 43770144, 939182976, 21981580224, 557527020544, 15236894019072, 446459870047232, 13964134704426752, 464407462322500608
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OFFSET
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1,4
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COMMENTS
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Column 2 of A265421.
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LINKS
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Table of n, a(n) for n=1..17.
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EXAMPLE
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Some solutions for n=6
..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..2..3....2..3....2..3....2..3....2..3....2..3....2..3....2..3....2..3....2..3
..0..1....1..4....0..4....0..4....4..0....0..4....4..5....1..0....1..4....4..0
..4..5....3..5....5..2....1..5....5..3....5..2....1..2....4..5....3..5....2..5
..3..2....0..4....3..1....2..3....1..4....1..4....4..5....2..3....2..4....3..4
..4..5....5..2....4..5....4..5....5..2....5..3....0..3....4..5....0..5....1..5
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CROSSREFS
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Cf. A265421.
Sequence in context: A099671 A196963 A220325 * A226705 A126967 A098402
Adjacent sequences: A265416 A265417 A265418 * A265420 A265421 A265422
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Dec 08 2015
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STATUS
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approved
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