A246483 Number of length 4+3 0..n arrays with no pair in any consecutive four terms totalling exactly n.

2, 28, 644, 3904, 24582, 91212, 317576, 857248, 2174090, 4780060, 10007052, 19154208, 35306894, 61236364, 103134992, 166247872, 261796626, 398879388, 596338580, 868942720, 1246516502, 1751814988, 2429877144, 3314320224

Offset: 1

Author

R. H. Hardin, Aug 27 2014

Keywords

• nonn

Comments

Row 4 of A246479

Examples

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

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) -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)