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A243043 Number of length n+3 0..7 arrays with no four elements in a row with pattern abab (with a!=b) and new values 0..7 introduced in 0..7 order 1
14, 47, 179, 760, 3545, 17955, 97849, 569236, 3508656, 22742717, 153854313, 1078282250, 7775488348, 57340807380, 430253623025, 3271242719566, 25119643436006, 194328481547041, 1511662452338046, 11807232538631331 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A243044
LINKS
FORMULA
Empirical: a(n) = 23*a(n-1) -190*a(n-2) +614*a(n-3) -135*a(n-4) -2559*a(n-5) +369*a(n-6) +7121*a(n-7) +5143*a(n-8) -7257*a(n-9) -15107*a(n-10) -9219*a(n-11) +2219*a(n-12) +7955*a(n-13) +6635*a(n-14) +3195*a(n-15) +982*a(n-16) +190*a(n-17) +21*a(n-18) +a(n-19)
EXAMPLE
Some solutions for n=4
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....1....1....1....0....0....1....1....0....1....1....0....1....1
..2....2....2....2....1....2....1....1....0....0....1....2....2....1....2....2
..3....3....2....2....1....3....0....1....2....2....2....1....0....1....3....0
..4....4....2....1....2....1....0....0....3....3....1....3....3....1....3....3
..1....1....2....3....1....1....2....1....4....2....0....3....0....0....4....1
..2....1....1....1....3....4....2....1....0....0....0....4....1....2....0....3
CROSSREFS
Sequence in context: A243040 A243041 A243042 * A013323 A205475 A205753
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 29 2014
STATUS
approved

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Last modified March 28 05:02 EDT 2024. Contains 371235 sequences. (Running on oeis4.)