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A268456
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Number of length-n 0..7 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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8, 64, 505, 3977, 31276, 245626, 1926444, 15089356, 118040270, 922247248, 7196716310, 56092274904, 436681564144, 3395712755366, 26376195676360, 204653424502050, 1586213921445534, 12281469122143732, 94993604706706795
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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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EXAMPLE
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Some solutions for n=5
..7....2....3....3....6....4....5....4....1....0....6....7....6....4....2....4
..6....5....2....6....5....4....1....1....6....2....1....4....5....1....4....1
..4....4....1....4....0....5....3....0....4....4....7....5....0....3....7....7
..5....4....1....5....1....0....4....7....3....2....2....3....7....4....3....0
..2....0....1....1....6....6....0....6....6....1....6....6....7....4....2....4
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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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