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A242469
Number of length n+2 0..6 arrays with no three equal elements in a row and new values 0..6 introduced in 0..6 order
1
4, 12, 41, 159, 685, 3232, 16497, 90075, 520248, 3143900, 19678699, 126480319, 828889655, 5508880129, 36980189248, 249999755818, 1698491520413, 11579658486155, 79137696973965, 541762392142995, 3713215153801152
OFFSET
1,1
COMMENTS
Column 6 of A242472
LINKS
FORMULA
Empirical: a(n) = 16*a(n-1) -79*a(n-2) +70*a(n-3) +361*a(n-4) -372*a(n-5) -964*a(n-6) +144*a(n-7) +1116*a(n-8) +720*a(n-9) +144*a(n-10)
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....0....1....1....1....1....1....1....0....1....1....1....1
..2....2....2....2....1....2....2....0....2....2....2....1....1....2....2....1
..3....1....3....3....1....0....3....2....0....3....0....0....2....1....0....2
..4....3....2....3....2....3....0....3....0....1....2....2....0....3....2....0
..3....4....4....4....3....0....3....2....1....1....1....1....0....3....3....1
CROSSREFS
Sequence in context: A149343 A225586 A242468 * A242470 A242471 A239800
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 15 2014
STATUS
approved