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A183881
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Number of arrangements of n+2 numbers in 0..6 with each number being the sum mod 7 of two others
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1
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1, 1, 1231, 32521, 424537, 4079713, 33702403, 257404033, 1885866973, 13515603289, 95750388631, 674299155193, 4734193668289, 33187816266097, 232479450595819, 1627911123290065, 11397233380815013, 79786797746740777, 558527947985495935
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OFFSET
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1,3
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..1....2....3....1....5....4....4....3....1....2....2....5....6....2....1....1
..3....0....2....3....2....5....6....5....5....5....6....3....1....1....3....4
..5....0....1....6....5....3....3....1....2....4....1....6....5....6....6....5
..2....0....3....2....0....2....5....5....3....3....5....2....2....4....3....2
..4....2....6....4....2....1....1....4....4....1....3....1....4....5....2....6
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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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