A246887 Number of length n+4 0..3 arrays with some pair in every consecutive five terms totalling exactly 3

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

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