A190936 Number of permutations of n copies of 1..8 introduced in order 1..8 with no element equal to another within a distance of 5

1, 2628, 8341096, 29584295480, 113973074548248, 468377213896673183, 2027292282593307983972, 9154283191553066456530508, 42808534280820262732168056032, 206132516276458610178941094332608

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

Crossrefs

Sequence in context: A236621 A221941 A234698 * A020439 A254776 A254769

Adjacent sequences: A190933 A190934 A190935 * A190937 A190938 A190939

Keyword

nonn

Author

R. H. Hardin May 23 2011

Status

approved