A268960 Number of length-(n+6) 0..n arrays with no repeated value equal to the previous repeated value, with new values introduced in sequential order.

15, 525, 6723, 58409, 426289, 2918103, 19899645, 139354433, 1014707218, 7708112426, 61057289906, 503473697674, 4313566395798, 38328567460364, 352618771825166, 3353663922642364, 32927374508631249, 333319732229912935

Offset

1,1

Comments

Subdiagonal 6 of A268956.

Links

R. H. Hardin, Table of n, a(n) for n = 1..116

Example

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

Crossrefs

Cf. A268956.

Sequence in context: A218235 A212739 A009068 * A157166 A074040 A002403

Adjacent sequences: A268957 A268958 A268959 * A268961 A268962 A268963

Keyword

nonn

Author

R. H. Hardin, Feb 16 2016

Status

approved