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 A190828 Number of permutations of 3 copies of 1..n introduced in order 1..n with no element equal to another within a distance of 3 0
 0, 0, 0, 1, 436, 105876, 27361381, 8448460856, 3162324496414 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 LINKS Table of n, a(n) for n=1..9. EXAMPLE Some solutions for n=5 ..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....1....5....5....1....1....5....5....5....5....1....5....5....5....5....5 ..2....5....2....1....5....2....1....1....1....2....5....1....2....2....2....1 ..1....3....3....2....2....5....2....3....2....3....3....3....3....3....1....3 ..4....2....4....3....4....4....4....2....3....1....4....2....4....4....4....2 ..5....4....1....4....3....3....5....5....5....5....2....4....5....1....5....5 ..3....5....5....5....5....1....1....4....4....4....1....1....2....5....3....1 ..1....3....3....2....2....5....3....3....1....3....5....5....1....2....2....4 ..2....2....4....3....1....4....2....1....2....1....3....2....3....3....4....2 ..4....1....2....1....4....3....5....5....5....5....2....4....4....1....1....3 ..3....5....5....5....3....2....4....2....4....4....4....3....5....5....3....5 ..5....4....1....4....5....5....3....4....3....2....5....5....1....4....5....4 CROSSREFS Sequence in context: A278176 A243233 A216988 * A084293 A237939 A088893 Adjacent sequences: A190825 A190826 A190827 * A190829 A190830 A190831 KEYWORD nonn AUTHOR R. H. Hardin May 21 2011 STATUS approved

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Last modified June 8 00:11 EDT 2023. Contains 363157 sequences. (Running on oeis4.)