A249215 Number of length 3+6 0..n arrays with no seven consecutive terms having five times the sum of any two elements equal to two times the sum of the remaining five.

496, 11874, 183516, 1287632, 6631348, 26526142, 89437990, 259680594, 678836386, 1608960332, 3563385010, 7370543098, 14518880248, 27241408064, 49261449504, 85646747520, 144718409622, 237078221134

Offset: 1

Author

R. H. Hardin, Oct 23 2014

Keywords

• nonn

Comments

Row 3 of A249212

Examples

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