A246477 Number of length n+3 0..6 arrays with no pair in any consecutive four terms totaling exactly 6.

966, 4386, 20004, 91212, 415650, 1893780, 8628792, 39320988, 179184654, 816514170, 3720653346, 16954232310, 77257406100, 352048294158, 1604217270528, 7310107829838, 33310766859666, 151790888076216, 691682436483000

Offset

1,1

Comments

Column 6 of A246479.

Links

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

Formula

Empirical: a(n) = 3*a(n-1) +2*a(n-2) +3*a(n-3) +77*a(n-4) +55*a(n-5) +59*a(n-6) +18*a(n-7) +a(n-8) +4*a(n-9) +a(n-10).

Example

Some solutions for n=4
..1....1....5....2....0....1....5....0....3....0....6....4....3....5....1....2
..0....4....5....0....0....1....4....0....2....5....3....5....1....5....1....1
..1....0....3....3....1....2....4....1....1....2....5....5....4....4....3....2
..2....4....5....5....3....0....6....0....1....2....5....4....1....6....1....6
..2....0....0....2....4....2....3....4....1....3....2....5....6....6....2....2
..3....4....5....5....6....5....5....0....3....5....0....3....1....6....0....6
..5....0....2....0....1....3....5....5....1....5....2....5....6....3....3....1

Crossrefs

Cf. A246479.

Sequence in context: A260291 A251232 A202049 * A064258 A142378 A035887

Adjacent sequences: A246474 A246475 A246476 * A246478 A246479 A246480

Keyword

nonn

Author

R. H. Hardin, Aug 27 2014

Status

approved