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A215397 Number of length n 0..4 arrays connected end-around, with no sequence of L<n elements immediately followed by itself ("periodic squarefree"), and new values introduced in order 0..4. 0
1, 1, 1, 3, 6, 26, 84, 324, 1170, 4412, 16313, 61138, 227383, 849667, 3168419, 11831104, 44144206, 164792736, 615027929, 2295714687 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
COMMENTS
Column 4 of A215401.
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....1....1....1....1....1....1....1....1....1....1....1....1....1....1
..2....0....2....2....2....2....2....2....2....2....2....2....0....0....2....2
..3....2....3....1....0....3....3....1....3....1....1....3....2....2....0....3
..2....1....1....0....3....1....4....3....4....0....3....0....3....3....1....2
..4....2....3....2....1....2....2....2....3....3....1....4....4....2....3....1
CROSSREFS
Sequence in context: A148665 A148666 A058258 * A359974 A214309 A005646
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 09 2012
STATUS
approved

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Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)