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A190829 Number of permutations of 3 copies of 1..n introduced in order 1..n with no element equal to another within a distance of 4 0
0, 0, 0, 0, 1, 1744, 930776, 403365340, 183903095593 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=6

..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

..1....1....6....1....6....1....6....6....6....1....6....6....6....6....6....6

..6....6....1....6....2....6....2....1....2....6....1....2....1....2....1....2

..3....3....2....3....3....3....1....3....3....2....2....1....3....3....3....1

..4....4....3....4....4....2....3....2....4....4....3....3....4....1....4....4

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

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

..6....6....5....6....1....1....2....1....5....6....1....6....2....5....5....6

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

..3....4....1....1....2....3....3....2....4....4....2....1....4....3....4....1

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

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

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

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

CROSSREFS

Sequence in context: A090837 A250466 A260014 * A038010 A324710 A201801

Adjacent sequences:  A190826 A190827 A190828 * A190830 A190831 A190832

KEYWORD

nonn

AUTHOR

R. H. Hardin May 21 2011

STATUS

approved

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Last modified July 30 21:32 EDT 2021. Contains 346365 sequences. (Running on oeis4.)