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

1,1

Comments

Row 7 of A248461

Links

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

Example

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

Crossrefs

Sequence in context: A213087 A284244 A232781 * A231967 A232339 A358256

Adjacent sequences: A248465 A248466 A248467 * A248469 A248470 A248471

Keyword

nonn

Author

R. H. Hardin, Oct 06 2014

Status

approved