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A212827
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Number of 0..6 arrays of length n with no adjacent pair equal to its immediately preceding adjacent pair, and new values introduced in 0..6 order
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1
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1, 2, 5, 13, 44, 168, 717, 3359, 17055, 92749, 534071, 3220152, 20122695, 129180223, 845868450, 5618381653, 37699577379, 254789247816, 1730682217663, 11797467544723, 80618379435810, 551861368167305, 3782253874750807
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 16*a(n-1) -79*a(n-2) +70*a(n-3) +361*a(n-4) -372*a(n-5) -964*a(n-6) +144*a(n-7) +1116*a(n-8) +720*a(n-9) +144*a(n-10) for n>13
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EXAMPLE
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Some solutions for n=8
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....1....1....1....1....0....1....1....1....1....1....1....0....1
..2....2....0....2....0....2....0....1....2....2....2....1....2....2....1....2
..3....3....2....0....0....3....2....1....1....3....1....0....2....0....2....2
..3....3....1....0....1....3....1....2....3....2....0....0....3....3....1....3
..0....2....2....1....1....3....2....2....3....4....3....2....4....0....3....2
..4....2....3....1....2....4....2....0....2....1....4....3....3....1....0....1
..0....4....3....3....2....2....2....0....1....2....5....4....5....3....3....3
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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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