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A269407
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Number of length-n 0..6 arrays with no repeated value greater than or equal to the previous repeated value.
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1
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7, 49, 336, 2289, 15477, 104006, 695135, 4623815, 30625210, 202067047, 1328649469, 8708852838, 56920021347, 371043659463, 2412849114074, 15655214564192, 101363364976160, 655024985471255, 4225174990367555, 27207648363845138
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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) = 42*a(n-1) -735*a(n-2) +6748*a(n-3) -32319*a(n-4) +53130*a(n-5) +172655*a(n-6) -705840*a(n-7) -418320*a(n-8) +3386880*a(n-9) +2522016*a(n-10) -7402752*a(n-11) -13063680*a(n-12) -7838208*a(n-13) -1679616*a(n-14)
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EXAMPLE
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Some solutions for n=6
..4. .4. .5. .6. .4. .3. .6. .0. .6. .6. .3. .5. .5. .2. .1. .0
..6. .4. .3. .2. .0. .0. .4. .3. .0. .2. .6. .1. .1. .1. .6. .4
..5. .5. .1. .4. .1. .3. .6. .1. .3. .1. .1. .2. .5. .6. .5. .6
..1. .1. .0. .0. .1. .4. .2. .4. .2. .2. .3. .6. .5. .5. .1. .5
..6. .2. .6. .1. .5. .4. .1. .0. .6. .4. .3. .2. .2. .6. .0. .1
..5. .3. .4. .5. .2. .3. .6. .3. .5. .6. .5. .0. .6. .5. .4. .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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