A190935 Number of permutations of n copies of 1..8 introduced in order 1..8 with no element equal to another within a distance of 4

1, 16924, 403365340, 11922480289932, 407090790228102102, 15381627927280923953894, 626076436927654841850687690, 26973009375096737119981280672009, 1215269783462969270931217890768937234

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n = 1..11

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....1....6....6....6
..7....7....2....7....7....7....7....7....7....1....7....7....6....7....7....1
..8....1....7....8....8....2....8....3....1....7....1....2....7....3....2....7
..1....4....8....4....2....8....1....8....8....3....4....4....8....4....8....2
..5....8....3....3....5....3....3....2....4....8....3....8....5....1....4....8
..4....2....5....2....4....6....2....1....6....6....8....5....2....8....6....4
..7....3....6....7....1....4....6....4....3....2....5....7....4....5....1....3
..3....6....4....5....3....5....4....5....5....7....6....3....6....2....3....5
..2....5....8....1....7....1....5....8....8....4....2....1....7....6....8....6
..6....8....1....8....8....8....7....7....7....8....7....6....3....7....5....7
..8....7....7....6....6....7....8....6....2....5....8....8....8....8....7....8

Crossrefs

Sequence in context: A170797 A259426 A200973 * A035922 A233497 A233498

Adjacent sequences: A190932 A190933 A190934 * A190936 A190937 A190938

Keyword

nonn

Author

R. H. Hardin May 23 2011

Status

approved