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A242470
Number of length n+2 0..7 arrays with no three equal elements in a row and new values 0..7 introduced in 0..7 order
1
4, 12, 41, 159, 685, 3233, 16533, 90817, 531812, 3295779, 21456363, 145645809, 1023308083, 7391587656, 54563960012, 409583330514, 3113836080693, 23899707589707, 184747234605277, 1435668152296255, 11200152289621048
OFFSET
1,1
COMMENTS
Column 7 of A242472
LINKS
FORMULA
Empirical: a(n) = 22*a(n-1) -168*a(n-2) +440*a(n-3) +421*a(n-4) -2898*a(n-5) -924*a(n-6) +7944*a(n-7) +5931*a(n-8) -6610*a(n-9) -10562*a(n-10) -5040*a(n-11) -840*a(n-12)
EXAMPLE
Some solutions for n=4
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..0....1....1....0....1....1....1....1....1....1....1....1....1....1....1....1
..1....2....2....1....2....2....2....2....2....0....2....0....1....1....2....2
..0....0....3....2....2....0....0....1....2....2....3....1....2....2....0....2
..2....1....3....2....0....2....3....3....3....0....4....1....0....0....0....1
..0....0....1....0....0....1....1....4....1....2....4....2....2....3....3....0
CROSSREFS
Sequence in context: A225586 A242468 A242469 * A242471 A239800 A237501
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 15 2014
STATUS
approved