A241610 Number of length n+2 0..4 arrays with no consecutive three elements summing to more than 4.

35, 105, 315, 889, 2567, 7483, 21631, 62547, 181255, 524877, 1519408, 4399720, 12740155, 36888358, 106810847, 309276700, 895517750, 2592992001, 7508089778, 21739889599, 62948442860, 182269006155, 527765093824, 1528158677522

Offset: 1

Author

R. H. Hardin, Apr 26 2014

Keywords

• nonn

Comments

Column 4 of A241619

Examples

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

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +a(n-2) +7*a(n-3) -4*a(n-4) -5*a(n-5) -12*a(n-6) +4*a(n-7) +3*a(n-8) +9*a(n-9) -3*a(n-10) -a(n-11) -3*a(n-12) +a(n-13) +a(n-15)