login
A243639
Number of length n+2 0..8 arrays with no three unequal elements in a row and new values 0..8 introduced in 0..8 order
1
4, 9, 21, 51, 127, 324, 844, 2243, 6073, 16737, 46905, 133556, 386062, 1132107, 3365627, 10137558, 30920924, 95456942, 298125982, 941555265, 3005897555, 9696696210, 31596681866, 103963289341, 345299662267, 1157307776719
OFFSET
1,1
COMMENTS
Column 8 of A243641
LINKS
FORMULA
Empirical: a(n) = 15*a(n-1) -76*a(n-2) +78*a(n-3) +554*a(n-4) -1518*a(n-5) -1000*a(n-6) +6492*a(n-7) -505*a(n-8) -13105*a(n-9) +2036*a(n-10) +13670*a(n-11) +672*a(n-12) -5632*a(n-13) -1680*a(n-14)
EXAMPLE
Some solutions for n=5
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..0....1....1....1....0....0....1....1....1....0....1....1....1....0....1....1
..1....1....1....1....1....1....1....1....0....0....0....0....0....0....0....1
..0....1....2....0....1....1....0....1....1....0....0....0....0....1....0....1
..0....2....1....0....2....1....0....1....1....0....1....2....0....1....0....0
..1....2....1....0....2....2....1....1....1....1....1....2....2....2....2....0
..0....2....2....2....3....2....1....2....0....0....2....1....2....1....0....1
CROSSREFS
Sequence in context: A243636 A243637 A243638 * A243640 A243634 A076861
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 08 2014
STATUS
approved