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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 1
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 (list; graph; refs; listen; history; text; internal format)
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: A006152 A143508 A052882 * A330200 A143922 A305304

Adjacent sequences:  A248437 A248438 A248439 * A248441 A248442 A248443

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 06 2014

STATUS

approved

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Last modified December 8 03:17 EST 2021. Contains 349590 sequences. (Running on oeis4.)