A248439 Number of length 6+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third.

2, 9, 44, 261, 590, 1105, 1684, 2775, 3978, 5365, 6776, 8639, 10512, 12467, 14562, 17349, 20144, 23213, 26282, 29727, 33264, 36831, 40398, 44775, 49264, 53769, 58386, 63261, 68136, 73375, 78614, 84601, 90640, 96693, 102922, 109691, 116460, 123235

Offset

1,1

Comments

Row 6 of A248433

Links

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

Example

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

Crossrefs

Sequence in context: A047119 A052881 A020071 * A259778 A260081 A259779

Adjacent sequences: A248436 A248437 A248438 * A248440 A248441 A248442

Keyword

nonn

Author

R. H. Hardin, Oct 06 2014

Status

approved