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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
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 A343322
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 08 2014
STATUS
approved

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Last modified March 28 08:22 EDT 2024. Contains 371236 sequences. (Running on oeis4.)