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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 A362875 A324710 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 December 10 19:44 EST 2023. Contains 367717 sequences. (Running on oeis4.)