A190937 Number of permutations of n copies of 1..8 introduced in order 1..8 with no element equal to another within a distance of 6

1, 160, 27904, 5116416, 970496256, 188745163168, 37428317148293, 7542831976684720, 1541320654071476368, 318820105535954581717, 66668953406861928775959, 14078842985707487656207628

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n = 1..17

Example

Some solutions for n=2
..1....1....1....1....1....1....1....1....1....1....1....1....1....1....1....1
..2....2....2....2....2....2....2....2....2....2....2....2....2....2....2....2
..3....3....3....3....3....3....3....3....3....3....3....3....3....3....3....3
..4....4....4....4....4....4....4....4....4....4....4....4....4....4....4....4
..5....5....5....5....5....5....5....5....5....5....5....5....5....5....5....5
..6....6....6....6....6....6....6....6....6....6....6....6....6....6....6....6
..7....7....7....7....7....7....7....7....7....7....7....7....7....7....7....7
..8....1....8....8....1....8....1....1....8....8....8....8....8....8....1....8
..2....8....2....1....8....1....8....8....1....2....1....2....1....1....8....1
..1....2....3....2....3....2....2....2....2....3....3....1....3....2....3....2
..4....4....4....3....2....3....4....3....4....4....2....4....2....4....2....4
..3....5....5....4....5....4....3....5....3....1....5....5....5....5....5....3
..6....3....1....5....6....6....5....4....5....5....4....3....6....3....6....5
..5....6....7....7....4....7....7....6....7....7....7....7....7....6....7....6
..8....7....6....6....7....5....6....7....6....8....8....6....8....7....4....7
..7....8....8....8....8....8....8....8....8....6....6....8....4....8....8....8

Crossrefs

Sequence in context: A233909 A035825 A183769 * A163056 A091550 A027553

Adjacent sequences: A190934 A190935 A190936 * A190938 A190939 A190940

Keyword

nonn

Author

R. H. Hardin May 23 2011

Status

approved