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A248540 Number of length 3+3 0..n arrays with every four consecutive terms having the sum of some three elements equal to three times the fourth 1
2, 15, 52, 125, 306, 555, 992, 1673, 2606, 3663, 5024, 6777, 8914, 11379, 14264, 17729, 21738, 26191, 31204, 36933, 43322, 50243, 57892, 66645, 76034, 86163, 97156, 109293, 122350, 136083, 150744, 166801, 183978, 202119, 221164, 241881, 263758 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A248537

LINKS

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

EXAMPLE

Some solutions for n=6

..6....0....5....4....3....2....0....4....3....5....5....6....0....0....1....2

..1....1....5....5....1....2....5....2....0....4....3....0....2....5....6....3

..5....1....4....3....3....3....1....3....2....5....6....3....5....2....2....0

..4....2....2....4....5....1....2....3....3....6....6....3....1....1....3....3

..6....0....5....4....3....6....0....4....3....5....5....6....0....0....1....2

..5....1....5....5....1....2....1....2....0....4....3....0....2....1....6....3

CROSSREFS

Sequence in context: A073877 A248538 A248539 * A007972 A248541 A248542

Adjacent sequences: A248537 A248538 A248539 * A248541 A248542 A248543

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 08 2014

STATUS

approved

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Last modified January 27 17:42 EST 2023. Contains 359845 sequences. (Running on oeis4.)