A246896 Number of length 4+4 0..n arrays with some pair in every consecutive five terms totalling exactly n

216, 5711, 46656, 264981, 942216, 2934691, 7216512, 16571465, 33296760, 64134231, 113503296, 195133981, 316514856, 502575851, 764948736, 1145338641, 1660700952, 2376636895, 3316691520, 4579210661, 6195659976, 8307888051, 10956656256

Offset

1,1

Comments

Row 4 of A246892

Links

R. H. Hardin, Table of n, a(n) for n = 1..73

Formula

Empirical: a(n) = 3*a(n-1) +2*a(n-2) -14*a(n-3) +5*a(n-4) +25*a(n-5) -20*a(n-6) -20*a(n-7) +25*a(n-8) +5*a(n-9) -14*a(n-10) +2*a(n-11) +3*a(n-12) -a(n-13)

Example

Some solutions for n=3
..2....2....3....2....2....3....0....3....3....1....2....3....2....1....3....1
..3....0....3....2....2....0....1....3....2....0....3....2....0....3....3....3
..2....0....0....1....1....0....1....0....2....3....0....3....2....1....1....0
..2....1....1....1....0....3....2....2....2....0....0....1....0....2....2....1
..1....0....3....3....0....0....2....1....0....0....1....2....1....1....0....0
..2....2....3....1....2....2....3....2....3....0....0....1....3....1....1....3
..2....1....2....2....3....1....3....2....2....3....3....3....1....1....3....1
..0....2....2....1....0....1....1....1....0....3....1....0....1....1....0....0

Crossrefs

Sequence in context: A114060 A128964 A096290 * A017595 A232835 A223272

Adjacent sequences: A246893 A246894 A246895 * A246897 A246898 A246899

Keyword

nonn

Author

R. H. Hardin, Sep 06 2014

Status

approved