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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. 1
7, 77, 499, 2785, 15124, 84572, 497262, 3090688, 20283861, 140149935, 1016257437, 7710982245, 61062373842, 503482366796, 4313580692976, 38328590354914, 352618807539531, 3353663977065151, 32927374589832727, 333319732348780989 (list; graph; refs; listen; history; text; internal format)
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: A292457 A292737 A213261 * A068667 A261741 A228414

Adjacent sequences:  A268955 A268956 A268957 * A268959 A268960 A268961

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 16 2016

STATUS

approved

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Last modified March 4 05:42 EST 2021. Contains 341779 sequences. (Running on oeis4.)