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A190932 Number of permutations of n copies of 1..8 introduced in order 1..8 with no element equal to another within a distance of 1 8
1, 721315, 1133879136649, 2536823683737613858, 6945222145021508480249929, 21671513613423101256198918372909, 74115215422015289392187745053216373265, 271259741131895052775392614041761701799270286 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Seiichi Manyama, Table of n, a(n) for n = 1..149 (terms 1..20 from R. H. Hardin)

FORMULA

a(n) ~ 2 * 7^(8*n-2) / (1215 * sqrt(3) * Pi^(7/2) * n^(7/2)). - Vaclav Kotesovec, Nov 24 2018

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

..1....3....3....1....1....1....3....1....3....3....1....1....1....1....3....1

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

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

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

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

..5....6....6....6....7....7....2....6....5....6....5....7....6....5....6....6

..6....7....7....7....5....2....3....7....6....5....6....8....7....7....7....7

..3....8....8....8....6....8....5....8....7....2....7....7....5....8....3....8

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

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

..8....8....7....4....3....4....8....5....8....7....7....3....7....4....6....7

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

..8....7....5....5....8....8....8....2....7....4....3....8....8....7....8....8

..7....6....8....2....7....7....4....7....8....8....8....6....6....8....5....6

CROSSREFS

Cf. A000012, A190917, A190918, A190920, A190923, A190927, A321987.

Sequence in context: A204403 A250372 A015346 * A153580 A153581 A100383

Adjacent sequences:  A190929 A190930 A190931 * A190933 A190934 A190935

KEYWORD

nonn

AUTHOR

R. H. Hardin May 23 2011

STATUS

approved

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Last modified April 20 14:27 EDT 2019. Contains 322310 sequences. (Running on oeis4.)