A263682 Number of length n arrays of permutations of 0..n-1 with each element moved by -7 to 7 places and with no two consecutive decreases.

1, 2, 5, 17, 70, 349, 2017, 13358, 85403, 514631, 2892717, 15496398, 80361985, 412478090, 2110690179, 10938840527, 57413943808, 304300790810, 1621734608963, 8661768091020, 46243202420814, 246483106624494, 1310659258937117

Offset

1,2

Comments

Column 7 of A263683.

Links

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

Example

Some solutions for n=7
..2....5....1....0....1....2....4....0....2....3....6....2....1....6....6....5
..6....1....0....5....2....4....1....3....3....1....0....5....3....4....1....0
..1....3....2....6....3....0....6....2....5....4....1....0....0....5....4....4
..4....6....3....3....6....6....0....4....0....6....5....4....6....1....2....6
..3....2....4....4....4....1....2....6....1....0....3....1....2....2....5....1
..5....4....5....1....5....3....5....1....4....2....4....6....5....3....0....2
..0....0....6....2....0....5....3....5....6....5....2....3....4....0....3....3

Crossrefs

Cf. A263683.

Sequence in context: A263641 A263681 A263642 * A049774 A317132 A335926

Adjacent sequences: A263679 A263680 A263681 * A263683 A263684 A263685

Keyword

nonn

Author

R. H. Hardin, Oct 23 2015

Status

approved