A217889 Number of n element 1..n arrays with each element the minimum of 6 adjacent elements of a permutation of 1..n+5 of n+5 elements

1, 3, 11, 45, 197, 903, 4278, 20788, 103050, 519268, 2653278, 13725388

Offset

1,2

Comments

Column 6 of A217891

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=4
..2....2....1....1....3....4....3....1....1....4....1....2....1....3....2....4
..4....2....1....3....1....2....2....1....2....3....1....3....4....3....2....2
..3....2....1....4....1....2....2....1....4....1....2....1....3....1....4....1
..1....1....4....2....1....1....1....1....3....1....4....1....2....1....1....1

Crossrefs

Sequence in context: A217888 A146086 A049177 * A217890 A001003 A080243

Adjacent sequences: A217886 A217887 A217888 * A217890 A217891 A217892

Keyword

nonn

Author

R. H. Hardin Oct 14 2012

Status

approved