A269683 Number of length-n 0..n arrays with no repeated value differing from the previous repeated value by plus or minus one modulo n+1.

2, 9, 64, 615, 7584, 114205, 2031072, 41651631, 967466240, 25102071621, 719516990160, 22578674361815, 769853562649248, 28340118309069645, 1120229004620264896, 47322526714956795615, 2127582051231624604416

Offset

1,1

Comments

Diagonal of A269690.

Links

R. H. Hardin, Table of n, a(n) for n = 1..193

Example

Some solutions for n=6
..1. .1. .6. .1. .5. .0. .0. .5. .4. .2. .2. .4. .2. .0. .6. .4
..5. .5. .3. .0. .1. .2. .2. .2. .5. .2. .3. .3. .0. .2. .1. .6
..3. .3. .4. .4. .0. .3. .0. .2. .5. .5. .5. .4. .6. .4. .6. .4
..6. .4. .4. .3. .5. .4. .6. .2. .0. .6. .3. .3. .3. .4. .3. .0
..5. .2. .1. .1. .0. .5. .4. .3. .3. .3. .1. .4. .0. .0. .6. .1
..2. .3. .0. .3. .5. .5. .6. .2. .5. .6. .0. .4. .4. .5. .5. .0

Crossrefs

Cf. A269690.

Sequence in context: A269612 A269577 A268104 * A331658 A269487 A179199

Adjacent sequences: A269680 A269681 A269682 * A269684 A269685 A269686

Keyword

nonn

Author

R. H. Hardin, Mar 03 2016

Status

approved