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

Author

R. H. Hardin, Aug 27 2014

Keywords

• nonn

Comments

Column 6 of A246479.

Examples

			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
		

Links

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

Crossrefs

Cf. A246479.

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).