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A243634 Number of length n+2 0..n arrays with no three unequal elements in a row and new values 0..n introduced in 0..n order. 2
4, 9, 21, 51, 127, 324, 844, 2243, 6073, 16737, 46905, 133556, 386062, 1132107, 3365627, 10137559, 30920943, 95457178, 298128278, 941574417, 3006040523, 9697677885, 31602993021, 104001763258, 345524136076, 1158570129917 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A243641.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..209

EXAMPLE

Some solutions for n=6

..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0

..1....1....0....1....1....1....1....1....0....1....0....1....1....0....1....0

..1....0....1....0....1....1....1....1....1....0....0....0....1....1....0....1

..1....1....1....0....2....0....2....1....1....1....1....0....0....0....1....1

..2....1....0....0....1....1....2....1....1....0....1....1....0....0....1....1

..2....2....0....0....1....0....1....2....2....0....1....1....2....1....2....1

..2....1....2....1....3....0....1....2....2....2....1....1....2....1....2....0

..2....1....2....0....3....1....1....1....2....0....0....0....1....0....1....0

CROSSREFS

Cf. A247100.

Sequence in context: A243638 A243639 A243640 * A076861 A048391 A041743

Adjacent sequences:  A243631 A243632 A243633 * A243635 A243636 A243637

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 08 2014

STATUS

approved

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Last modified October 18 11:56 EDT 2018. Contains 316321 sequences. (Running on oeis4.)