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A243604
Number of length n+2 0..7 arrays with no three elements in a row with pattern aba (with a!=b) and new values 0..7 introduced in 0..7 order
1
4, 10, 29, 97, 366, 1534, 7049, 35129, 187993, 1069914, 6413136, 40104257, 259358085, 1721368017, 11650893890, 80015045418, 555433766065, 3885803906493, 27339242339942, 193138394368496, 1368463903086546, 9716805805575427
OFFSET
1,1
COMMENTS
Column 7 of A243607
LINKS
FORMULA
Empirical: a(n) = 23*a(n-1) -206*a(n-2) +894*a(n-3) -1814*a(n-4) +902*a(n-5) +1940*a(n-6) -1536*a(n-7) -1306*a(n-8) +394*a(n-9) +526*a(n-10) +162*a(n-11) +21*a(n-12) +a(n-13)
EXAMPLE
Some solutions for n=5
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....0....1....0....1....1....0....1....1....1....1....1....0....1
..2....2....2....1....1....0....2....2....1....2....2....2....2....1....1....2
..3....0....2....2....2....0....3....2....2....3....3....0....2....2....2....3
..3....1....0....2....2....1....0....3....2....1....1....0....3....3....0....1
..3....2....1....3....1....1....2....1....1....0....4....0....1....0....1....0
..4....0....2....3....1....1....2....4....1....4....2....2....1....1....2....2
CROSSREFS
Sequence in context: A243601 A243602 A243603 * A243605 A243606 A151874
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 07 2014
STATUS
approved