A263739 Number of length n arrays of permutations of 0..n-1 with each element moved by -3 to 3 places and equal numbers of elements moved upwards and downwards

1, 2, 4, 14, 36, 110, 277, 823, 2292, 6862, 19518, 57932, 167852, 499181, 1464997, 4360738, 12891144, 38436616, 114235572, 341264028, 1018047671, 3046747775, 9114371288, 27322966348, 81915150788, 245937559472, 738620368466

Offset

1,2

Comments

Column 3 of A263744

Links

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

Example

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

Crossrefs

Cf. A263744

Sequence in context: A088028 A327459 A336108 * A333892 A135960 A216630

Adjacent sequences: A263736 A263737 A263738 * A263740 A263741 A263742

Keyword

nonn

Author

R. H. Hardin, Oct 25 2015

Status

approved