A248440 Number of length 7+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third

2, 9, 52, 389, 1014, 2021, 3200, 5589, 8218, 11401, 14696, 18947, 23274, 27861, 32772, 39481, 46246, 53633, 61036, 69369, 77910, 86569, 95228, 105879, 116826, 127859, 139132, 150965, 162798, 175561, 188324, 203137, 218098, 233121, 248604, 265287

Offset

1,1

Comments

Row 7 of A248433

Links

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

Example

Some solutions for n=6
..4....2....1....3....3....6....5....1....4....5....1....6....3....2....4....2
..0....0....0....2....4....4....3....2....2....1....0....5....4....3....2....6
..2....4....2....4....5....5....1....3....0....3....2....4....5....4....6....4
..4....2....1....3....3....3....5....1....4....2....1....3....3....2....4....5
..0....3....0....2....4....1....3....2....2....4....0....5....4....0....5....3
..2....4....2....1....5....2....4....0....6....3....2....1....2....1....6....4
..1....2....4....3....3....3....5....4....4....2....4....3....3....2....4....2
..3....3....6....5....4....4....3....2....2....1....6....5....4....0....2....0
..5....4....2....4....5....5....4....0....3....3....5....4....5....4....6....1

Crossrefs

Sequence in context: A369551 A143508 A052882 * A330200 A143922 A305304

Adjacent sequences: A248437 A248438 A248439 * A248441 A248442 A248443

Keyword

nonn

Author

R. H. Hardin, Oct 06 2014

Status

approved