A248468 Number of length 7+2 0..n arrays with no three consecutive terms having the sum of any two elements equal to twice the third.

110, 1152, 43940, 387488, 2582406, 11447368, 44452660, 139623544, 400150926, 1002628764, 2352502608, 5078891508, 10430306882, 20141675148, 37480145240, 66683720948, 115148012058, 192026426768, 312626222120, 495163608752

Offset: 1

Author

R. H. Hardin, Oct 06 2014

Keywords

• nonn

Comments

Row 7 of A248461

Examples

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

Links

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