A268958 Number of length-(n+4) 0..n arrays with no repeated value equal to the previous repeated value, with new values introduced in sequential order.

7, 77, 499, 2785, 15124, 84572, 497262, 3090688, 20283861, 140149935, 1016257437, 7710982245, 61062373842, 503482366796, 4313580692976, 38328590354914, 352618807539531, 3353663977065151, 32927374589832727, 333319732348780989

Offset

1,1

Comments

Subdiagonal 4 of A268956.

Links

R. H. Hardin, Table of n, a(n) for n = 1..118

Example

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

Crossrefs

Cf. A268956.

Sequence in context: A292737 A352995 A213261 * A068667 A261741 A228414

Adjacent sequences: A268955 A268956 A268957 * A268959 A268960 A268961

Keyword

nonn

Author

R. H. Hardin, Feb 16 2016

Status

approved