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A269460
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Number of length-n 0..n arrays with no repeated value equal to the previous repeated value.
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1
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2, 9, 60, 580, 7170, 108402, 1934856, 39808584, 927352710, 24123618310, 693066874236, 21793557008028, 744461976979994, 27451268150267850, 1086741065393740560, 45971289976043485456, 2069440771476789080334
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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=6
..2. .5. .2. .3. .4. .0. .4. .2. .6. .5. .0. .0. .1. .6. .4. .5
..0. .2. .0. .6. .4. .6. .6. .3. .3. .3. .3. .3. .5. .4. .6. .1
..0. .3. .2. .2. .3. .3. .0. .3. .5. .6. .6. .5. .5. .2. .3. .5
..2. .6. .1. .6. .5. .5. .5. .6. .5. .4. .3. .1. .2. .2. .5. .0
..2. .3. .5. .2. .3. .6. .0. .5. .6. .1. .4. .0. .2. .6. .4. .1
..6. .1. .5. .4. .2. .2. .0. .1. .3. .2. .3. .3. .3. .3. .4. .5
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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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