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A244178
Number of length n+4 0..3 arrays with no five consecutive elements with pattern ababa or abbba (possibly a=b) and new values 0..3 introduced in 0..3 order
1
48, 173, 650, 2495, 9667, 37604, 146521, 571315, 2228340, 8692454, 33909901, 132287996, 516081723, 2013345287, 7854504270, 30642176351, 119542013302, 466360306590, 1819376645854, 7097798434855, 27690112004115, 108025370530911
OFFSET
1,1
COMMENTS
Column 3 of A244185
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +6*a(n-2) +6*a(n-3) +3*a(n-4) -10*a(n-5) -23*a(n-6) -34*a(n-7) -36*a(n-8) -28*a(n-9) -19*a(n-10) -8*a(n-11) -3*a(n-12)
EXAMPLE
Some solutions for n=6
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..0....1....1....1....1....1....1....1....0....1....1....1....0....1....1....1
..1....2....2....0....1....1....1....2....1....2....0....2....1....2....2....1
..2....0....1....2....2....0....2....0....2....1....1....2....2....3....1....2
..0....3....2....2....2....1....2....0....1....0....2....2....3....0....3....3
..1....1....0....0....2....2....1....3....0....2....2....2....1....1....0....1
..0....2....3....3....3....3....1....1....1....2....1....0....1....2....0....3
..0....0....3....1....2....0....1....0....3....0....0....2....0....1....3....2
..3....1....1....0....2....3....3....1....1....1....2....0....2....2....3....1
..2....1....3....1....3....0....2....0....3....2....0....0....0....3....2....2
CROSSREFS
Sequence in context: A248456 A370126 A346293 * A131683 A066134 A233682
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 21 2014
STATUS
approved