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A268455
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Number of length-n 0..6 arrays with no adjacent pair x,x+1 followed at any distance by x+1,x.
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1
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7, 49, 337, 2311, 15816, 108032, 736525, 5012171, 34047931, 230889543, 1563104184, 10564826628, 71293105297, 480355314513, 3231663192859, 21709801573961, 145636117720769, 975623832619371, 6526972402359763, 43608650962250889
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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 recurrence of order 89 (see link above)
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EXAMPLE
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Some solutions for n=6
..4....4....2....2....4....1....0....4....5....1....2....4....2....0....3....1
..4....3....6....4....1....0....0....2....4....0....4....3....3....4....6....1
..4....0....6....5....3....6....3....1....0....6....2....1....3....3....2....2
..0....4....4....6....0....5....5....0....4....6....3....3....4....2....4....0
..6....4....4....4....2....2....3....4....1....6....0....5....5....1....3....5
..3....5....1....4....2....0....5....3....0....5....6....1....1....2....1....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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