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 A190836 Number of permutations of 7 copies of 1..n introduced in order 1..n with no element equal to another within a distance of 1. 6

%I

%S 1,0,1,56620,22875971289,36533294879349056,183095824753841610373405,

%T 2421032324142610480402567434373,

%U 74115215422015289392187745053216373265,4749303210651587675797285013227098386984170468,588242979144354234332728292738493758656488275002948671

%N Number of permutations of 7 copies of 1..n introduced in order 1..n with no element equal to another within a distance of 1.

%H Seiichi Manyama, <a href="/A190836/b190836.txt">Table of n, a(n) for n = 0..88</a> (terms 1..11 from R. J. Mathar)

%F a(n) ~ sqrt(7) * 117649^n * n^(6*n) / (720^n * exp(6*n + 6)). - _Vaclav Kotesovec_, Nov 24 2018

%e Some solutions for n=3

%e ..1....1....1....1....1....1....1....1....1....1....1....1....1....1....1....1

%e ..2....2....2....2....2....2....2....2....2....2....2....2....2....2....2....2

%e ..3....1....3....3....3....3....1....3....3....1....1....1....3....1....3....1

%e ..1....3....1....1....2....2....3....2....2....2....3....2....1....3....2....3

%e ..2....1....2....2....3....3....2....3....1....3....2....1....3....1....3....2

%e ..3....2....3....3....2....1....1....1....3....1....3....3....1....2....1....3

%e ..1....3....2....1....1....3....2....3....1....3....1....1....3....1....2....2

%e ..2....2....1....3....3....1....3....2....2....2....3....2....1....3....3....3

%e ..3....3....2....1....1....2....1....1....3....3....2....3....3....1....2....1

%e ..1....2....3....3....2....1....3....2....2....1....3....1....2....2....1....3

%e ..3....1....1....2....3....3....2....3....3....2....1....2....1....3....3....1

%e ..2....3....2....3....1....1....1....2....2....3....3....1....2....1....1....3

%e ..3....2....3....1....3....3....3....1....3....1....2....3....3....3....2....2

%e ..1....3....2....2....2....2....2....3....1....2....3....2....2....1....1....1

%e ..2....1....3....1....1....3....1....2....3....3....2....3....3....2....3....2

%e ..1....2....2....2....3....2....3....1....1....1....1....1....2....3....1....3

%e ..2....1....1....3....1....3....2....3....3....2....2....3....3....2....2....2

%e ..3....3....3....2....3....2....3....1....1....3....1....2....2....3....3....1

%e ..1....1....1....3....2....1....2....3....2....2....2....3....1....2....1....2

%e ..2....2....3....1....1....2....1....1....1....3....3....2....2....3....3....1

%e ..3....3....1....2....2....1....3....2....2....1....1....3....1....2....2....3

%K nonn

%O 0,4

%A _R. H. Hardin_ May 21 2011

%E a(0)=1 prepended by _Seiichi Manyama_, Nov 16 2018

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Last modified July 24 21:47 EDT 2021. Contains 346273 sequences. (Running on oeis4.)