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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
1, 237135, 113320421342, 75493034668888898, 61020892783461730439520, 55972697524167501761912203050, 56130843535667787404732305560914654, 60145268975482058312829825943102522201980 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 21 05:28 EDT 2021. Contains 348141 sequences. (Running on oeis4.)