A190925 Number of permutations of n copies of 1..6 introduced in order 1..6 with no element equal to another within a distance of 3

1, 292, 105876, 44288275, 20437852622, 10113495071580, 5269762016304712, 2856775055641524277, 1597895488904165852658, 916687622818117768899294, 537007089073991920696345332, 320160637492321800832759074249

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n = 1..26

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....1....5....5....5....5....5
..6....1....2....2....6....1....6....1....1....1....5....6....1....6....6....2
..3....6....6....6....1....6....1....6....6....3....3....1....6....2....2....6
..2....3....3....1....2....2....3....4....4....6....6....3....3....1....4....3
..4....5....4....3....3....5....2....2....3....2....2....5....2....5....1....5
..5....2....1....4....4....3....6....5....5....5....4....6....5....4....3....1
..1....4....5....5....6....4....4....6....2....4....5....2....4....3....5....4
..6....6....6....6....5....6....5....3....6....6....6....4....6....6....6....6

Crossrefs

Sequence in context: A238321 A231662 A098249 * A232280 A202888 A217181

Adjacent sequences: A190922 A190923 A190924 * A190926 A190927 A190928

Keyword

nonn

Author

R. H. Hardin May 23 2011

Status

approved