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 A190930 Number of permutations of n copies of 1..7 introduced in order 1..7 with no element equal to another within a distance of 4 1
 1, 876, 930776, 1121366420, 1480802920785, 2096040262602013, 3130500265589863279, 4877720372114515794195, 7863552772351099534263185, 13036319691799230161857187106, 22121167328810053450410257014723 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS R. H. Hardin, Table of n, a(n) for n = 1..17 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 ..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 ..6....6....6....6....6....1....6....6....6....6....6....1....6....6....6....6 ..7....7....7....7....7....6....7....1....7....7....7....6....7....2....1....2 ..1....2....3....2....1....3....1....3....1....3....2....7....2....7....7....7 ..2....4....4....4....3....7....4....7....4....4....3....2....4....3....3....1 ..3....5....2....1....2....4....3....5....5....1....4....4....3....5....5....5 ..4....1....6....6....6....5....6....4....3....2....5....3....6....1....2....4 ..6....3....5....3....5....2....7....6....2....5....7....6....5....4....6....6 ..5....6....1....5....7....6....2....2....6....6....1....7....1....6....4....7 ..7....7....7....7....4....7....5....7....7....7....6....5....7....7....7....3 CROSSREFS Sequence in context: A297511 A297725 A185989 * A209743 A346900 A346884 Adjacent sequences:  A190927 A190928 A190929 * A190931 A190932 A190933 KEYWORD nonn AUTHOR R. H. Hardin May 23 2011 STATUS approved

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Last modified May 16 19:04 EDT 2022. Contains 353720 sequences. (Running on oeis4.)