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 A190927 Number of permutations of n copies of 1..7 introduced in order 1..7 with no element equal to another within a distance of 1. 8
 1, 47844, 4420321081, 551248360550999, 81644850343968535401, 13519747358522016160671387, 2421032324142610480402567434373, 459408385876250801291447710561829082, 91155245844064069307740171414201519055298 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Seiichi Manyama, Table of n, a(n) for n = 1..185 (terms 1..25 from R. H. Hardin) FORMULA a(n) ~ 343 * sqrt(7) * 2^(7*n-8) * 3^(7*n-3) / (625 * Pi^3 * n^3). - 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 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 2 2 4 4 4 2 4 4 4 4 2 5 5 5 1 5 4 4 2 5 5 4 2 1 3 2 1 6 6 6 5 6 5 3 5 3 6 5 4 4 5 5 4 2 7 4 6 7 6 5 6 6 3 6 5 5 6 6 5 7 3 5 4 2 3 6 5 7 7 7 1 6 4 4 6 5 4 2 2 1 5 7 6 2 6 3 6 7 5 7 7 6 5 6 3 6 4 5 1 4 1 7 3 2 7 1 3 4 6 1 5 7 7 7 3 7 7 5 7 5 2 7 4 3 2 7 7 5 1 1 7 1 5 1 6 7 1 5 6 7 7 3 6 4 6 6 4 5 4 6 5 6 7 6 7 1 1 7 7 3 7 4 7 6 2 4 7 3 6 3 5 CROSSREFS Cf. A000012 (b=2), A190917 (b=3), A190918 (b=4), A190920 (b=5), A190923 (b=6), A190932 (b=8), A321987 (b=9). Sequence in context: A254800 A254807 A253816 * A251455 A204402 A203929 Adjacent sequences: A190924 A190925 A190926 * A190928 A190929 A190930 KEYWORD nonn AUTHOR R. H. Hardin, May 23 2011 STATUS approved

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Last modified May 29 22:39 EDT 2023. Contains 363044 sequences. (Running on oeis4.)