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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A246892

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

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

Adjacent sequences:  A246884 A246885 A246886 * A246888 A246889 A246890

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 06 2014

STATUS

approved

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Last modified June 17 04:55 EDT 2021. Contains 345080 sequences. (Running on oeis4.)