A268961 Number of length-(n+7) 0..n arrays with no repeated value equal to the previous repeated value, with new values introduced in sequential order.

23, 1361, 24714, 272738, 2355975, 18146537, 134520386, 1002621328, 7680218714, 60997066270, 503350821180, 4313327580676, 38328122520204, 352617973045358, 3353662534979250, 32927372167566264, 333319728382967773

Offset

1,1

Comments

Subdiagonal 7 of A268956.

Links

R. H. Hardin, Table of n, a(n) for n = 1..115

Example

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

Crossrefs

Cf. A268956.

Sequence in context: A353143 A201309 A049003 * A196422 A351508 A248703

Adjacent sequences: A268958 A268959 A268960 * A268962 A268963 A268964

Keyword

nonn

Author

R. H. Hardin, Feb 16 2016

Status

approved