A263591 Number of length n arrays of permutations of 0..n-1 with each element moved by -n to n places and the median of every three consecutive elements nondecreasing.

1, 2, 6, 16, 52, 208, 800, 3360, 16224, 78088, 393408, 2189872, 12371616, 71835000, 448860480, 2871278464, 18727425440, 129070035784, 913845701344

Offset: 1

Author

R. H. Hardin, Oct 22 2015

Keywords

• nonn

Comments

Diagonal of A263597.

Examples

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

Crossrefs

Cf. A263597.