A190933 Number of permutations of n copies of 1..8 introduced in order 1..8 with no element equal to another within a distance of 2

1, 237135, 113320421342, 75493034668888898, 61020892783461730439520, 55972697524167501761912203050, 56130843535667787404732305560914654, 60145268975482058312829825943102522201980

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

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

Crossrefs

Sequence in context: A344352 A344353 A324898 * A122474 A048423 A251363

Adjacent sequences: A190930 A190931 A190932 * A190934 A190935 A190936

Keyword

nonn

Author

R. H. Hardin May 23 2011

Status

approved