A241611 Number of length n+2 0..5 arrays with no consecutive three elements summing to more than 5.

56, 196, 686, 2254, 7586, 25774, 86828, 292621, 988303, 3335451, 11253229, 37977866, 128168421, 432512171, 1459576829, 4925618766, 16622258696, 56094381015, 189299674740, 638822175369, 2155807165360, 7275117316894

Offset: 1

Author

R. H. Hardin, Apr 26 2014

Keywords

• nonn

Comments

Column 5 of A241619

Examples

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

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +2*a(n-2) +12*a(n-3) -4*a(n-4) -12*a(n-5) -36*a(n-6) +2*a(n-7) +16*a(n-8) +47*a(n-9) -4*a(n-10) -16*a(n-11) -33*a(n-12) +4*a(n-13) +10*a(n-14) +16*a(n-15) -a(n-16) -3*a(n-17) -4*a(n-18) +a(n-20) +a(n-21)