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A269493
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Number of length-n 0..7 arrays with no repeated value differing from the previous repeated value by one.
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1
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8, 64, 512, 4082, 32460, 257536, 2039274, 16120298, 127240496, 1003029086, 7897819380, 62124999480, 488250966838, 3834268407348, 30090123746866, 235994522394958, 1849892639767268, 14493867039521420, 113511139403772878
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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) = 35*a(n-1) -483*a(n-2) +3234*a(n-3) -9950*a(n-4) +7266*a(n-5) +16356*a(n-6) +1169*a(n-7) -487*a(n-8) -21*a(n-9)
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EXAMPLE
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Some solutions for n=5
..6. .4. .3. .5. .4. .3. .5. .1. .0. .4. .3. .3. .0. .1. .0. .3
..1. .5. .3. .5. .6. .7. .0. .3. .2. .0. .2. .1. .1. .2. .0. .6
..1. .5. .2. .2. .4. .7. .2. .2. .2. .6. .5. .3. .7. .1. .0. .6
..4. .6. .1. .4. .4. .1. .0. .3. .5. .0. .6. .6. .1. .4. .2. .0
..6. .7. .2. .6. .7. .3. .2. .2. .2. .0. .0. .3. .2. .0. .1. .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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