A263665 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 increases or two consecutive decreases.

1, 2, 4, 10, 32, 122, 544, 2770, 13102, 53324, 201822, 744369, 2681622, 9781781, 35830358, 134471953, 510679902, 1948913086, 7413069078, 28251926154, 106925701022, 405357452874, 1528103687814, 5781674554622, 21790410540302

Offset

1,2

Comments

Column 7 of A263666.

Links

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

Example

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

Crossrefs

Cf. A263666.

Sequence in context: A263663 A176006 A263664 * A001250 A013032 A098830

Adjacent sequences: A263662 A263663 A263664 * A263666 A263667 A263668

Keyword

nonn

Author

R. H. Hardin, Oct 23 2015

Status

approved