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Number of permutations of n copies of 1..8 introduced in order 1..8 with no element equal to another within a distance of 6
1

%I #5 Mar 31 2012 12:36:20

%S 1,160,27904,5116416,970496256,188745163168,37428317148293,

%T 7542831976684720,1541320654071476368,318820105535954581717,

%U 66668953406861928775959,14078842985707487656207628

%N Number of permutations of n copies of 1..8 introduced in order 1..8 with no element equal to another within a distance of 6

%H R. H. Hardin, <a href="/A190937/b190937.txt">Table of n, a(n) for n = 1..17</a>

%e Some solutions for n=2

%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....3....3....3....3....3....3....3....3....3....3....3....3....3....3....3

%e ..4....4....4....4....4....4....4....4....4....4....4....4....4....4....4....4

%e ..5....5....5....5....5....5....5....5....5....5....5....5....5....5....5....5

%e ..6....6....6....6....6....6....6....6....6....6....6....6....6....6....6....6

%e ..7....7....7....7....7....7....7....7....7....7....7....7....7....7....7....7

%e ..8....1....8....8....1....8....1....1....8....8....8....8....8....8....1....8

%e ..2....8....2....1....8....1....8....8....1....2....1....2....1....1....8....1

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

%e ..4....4....4....3....2....3....4....3....4....4....2....4....2....4....2....4

%e ..3....5....5....4....5....4....3....5....3....1....5....5....5....5....5....3

%e ..6....3....1....5....6....6....5....4....5....5....4....3....6....3....6....5

%e ..5....6....7....7....4....7....7....6....7....7....7....7....7....6....7....6

%e ..8....7....6....6....7....5....6....7....6....8....8....6....8....7....4....7

%e ..7....8....8....8....8....8....8....8....8....6....6....8....4....8....8....8

%K nonn

%O 1,2

%A _R. H. Hardin_ May 23 2011