A263681 Number of length n arrays of permutations of 0..n-1 with each element moved by -6 to 6 places and with no two consecutive decreases.

1, 2, 5, 17, 70, 349, 2017, 11253, 58743, 286327, 1331630, 6077344, 27523597, 126333667, 587717372, 2760990038, 13033515692, 61583867944, 290639649211, 1368090247852, 6426462715392, 30151737816899, 141417395713905

Offset

1,2

Comments

Column 6 of A263683.

Links

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

Example

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

Crossrefs

Cf. A263683.

Sequence in context: A263640 A263680 A263641 * A263642 A263682 A049774

Adjacent sequences: A263678 A263679 A263680 * A263682 A263683 A263684

Keyword

nonn

Author

R. H. Hardin, Oct 23 2015

Status

approved