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A246887
Number of length n+4 0..3 arrays with some pair in every consecutive five terms totalling exactly 3
1
900, 3364, 12544, 46656, 173056, 643204, 2390116, 8880400, 32993536, 122589184, 455480964, 1692335044, 6287855616, 23362511104, 86803301376, 322517224836, 1198311166276, 4452319442704, 16542571369536, 61463843852544
OFFSET
1,1
COMMENTS
Column 3 of A246892
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +4*a(n-2) +6*a(n-3) +12*a(n-4) -4*a(n-5) -6*a(n-6) -2*a(n-8) +a(n-10)
EXAMPLE
Some solutions for n=5
..0....1....0....0....2....2....0....1....1....0....0....2....1....2....0....2
..3....2....1....2....3....3....0....0....0....0....2....3....0....0....3....1
..0....2....1....2....2....1....0....2....0....1....3....0....0....3....3....1
..3....1....2....3....3....0....3....0....0....3....2....0....0....2....1....2
..1....2....1....2....0....2....1....2....2....2....1....1....3....1....1....0
..1....0....2....0....0....2....0....1....1....3....3....3....0....3....0....1
..2....2....2....1....3....1....2....1....1....1....0....2....2....1....3....2
..0....1....1....3....3....1....0....2....1....3....2....3....1....0....0....0
..3....3....3....2....3....3....1....1....3....2....1....3....1....1....1....2
CROSSREFS
Sequence in context: A162143 A258888 A287800 * A232556 A069096 A232557
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 06 2014
STATUS
approved