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 A190931 Number of permutations of n copies of 1..7 introduced in order 1..7 with no element equal to another within a distance of 5 1
 1, 80, 6976, 639552, 60656016, 5898286349, 585487585760, 59147199364720, 6067259409345901, 630842897289489196, 66388460469198215359, 7062901351795999772739, 758832478269321359233282 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS R. H. Hardin, Table of n, a(n) for n = 1..25 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....6....6....6....6....6....6....6....6....6....6....6 ..1....7....7....1....7....7....7....1....7....1....7....7....7....7....7....7 ..7....2....1....7....1....1....1....7....1....7....1....1....1....2....1....1 ..2....1....2....2....2....2....3....3....2....3....2....2....2....3....3....2 ..3....3....4....3....3....3....2....4....3....2....4....4....3....1....4....3 ..4....4....3....5....5....4....5....2....4....5....3....5....5....4....2....5 ..5....5....5....6....6....5....6....5....6....6....6....6....4....5....5....6 ..6....6....7....4....4....6....7....6....7....4....5....7....6....7....6....7 ..7....7....6....7....7....7....4....7....5....7....7....3....7....6....7....4 CROSSREFS Sequence in context: A216987 A283102 A259076 * A006202 A278736 A116252 Adjacent sequences:  A190928 A190929 A190930 * A190932 A190933 A190934 KEYWORD nonn AUTHOR R. H. Hardin May 23 2011 STATUS approved

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Last modified December 13 17:13 EST 2019. Contains 329970 sequences. (Running on oeis4.)