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%I #5 Mar 31 2012 12:36:20
%S 1,1146,2001240,4336589521,10691055854826,28712861760925166,
%T 81958815992936732932,244852995292964593983615,
%U 757831532841526180711756422,2412699575781124816170722396128
%N Number of permutations of n copies of 1..6 introduced in order 1..6 with no element equal to another within a distance of 2
%H R. H. Hardin, <a href="/A190924/b190924.txt">Table of n, a(n) for n = 1..27</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....1....4....4....1....4....4....4....4....4
%e ..5....5....5....5....5....1....5....4....5....5....4....5....5....5....2....5
%e ..6....2....2....1....6....3....6....2....2....6....5....6....3....3....5....6
%e ..2....1....4....3....2....2....4....5....6....2....2....3....6....1....4....1
%e ..5....3....6....6....1....5....5....6....5....3....6....2....2....6....6....2
%e ..1....6....1....5....3....6....1....4....4....6....5....6....4....4....5....3
%e ..3....5....5....4....4....4....2....5....6....1....4....4....6....5....3....5
%e ..4....4....6....6....5....5....6....6....3....5....3....1....1....2....1....4
%e ..6....6....3....2....6....6....3....3....1....4....6....5....5....6....6....6
%K nonn
%O 1,2
%A _R. H. Hardin_ May 23 2011
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