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A242471
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Number of length n+2 0..8 arrays with no three equal elements in a row and new values 0..8 introduced in 0..8 order
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1
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4, 12, 41, 159, 685, 3233, 16534, 90862, 532958, 3317613, 21803646, 150528288, 1086089333, 8146481406, 63182485967, 504037166445, 4115582321241, 34244236336515, 289252828167957, 2472398717507023, 21329556857593204
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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: a(n) = 29*a(n-1) -314*a(n-2) +1449*a(n-3) -1442*a(n-4) -8855*a(n-5) +16059*a(n-6) +34312*a(n-7) -42104*a(n-8) -101900*a(n-9) -6124*a(n-10) +112608*a(n-11) +106128*a(n-12) +40320*a(n-13) +5760*a(n-14)
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EXAMPLE
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Some solutions for n=5
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....1....1....1....1....1....1....0....1....1....1....1....1....0
..2....2....2....1....2....1....2....1....2....1....2....1....1....2....2....1
..3....3....2....2....2....0....3....2....3....2....3....2....0....3....3....2
..0....0....3....2....1....2....0....2....4....3....2....2....1....0....4....0
..4....4....4....0....2....2....2....3....2....4....0....1....1....3....1....3
..0....5....4....1....1....3....4....3....1....3....4....3....2....1....2....1
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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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