A190934 Number of permutations of n copies of 1..8 introduced in order 1..8 with no element equal to another within a distance of 3

1, 69862, 8448460856, 1368009041285362, 264254904464540309234, 57423352933863499038305899, 13572657844345224433713852762532, 3416706600719684324699523157615472238

Offset

1,2

Links

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

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

Crossrefs

Sequence in context: A154818 A069919 A116502 * A043600 A043858 A043876

Adjacent sequences: A190931 A190932 A190933 * A190935 A190936 A190937

Keyword

nonn

Author

R. H. Hardin May 23 2011

Status

approved