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

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

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