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Number of permutations of n copies of 1..6 introduced in order 1..6 with no element equal to another within a distance of 4
1

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

%S 1,40,1744,79944,3791001,184877712,9230302913,470167308382,

%T 24367956213267,1282234744431834,68376498305017644,

%U 3689492332817242036,201174991614802295504,11072289690651114833968,614516844070147078701721

%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 4

%H R. H. Hardin, <a href="/A190926/b190926.txt">Table of n, a(n) for n = 1..37</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....1....1....6....6....6....1....6....6....6....6....6....6....6

%e ..2....2....1....6....6....1....1....1....6....1....2....1....2....2....1....2

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

%e ..4....4....4....2....2....2....3....4....3....2....4....4....1....4....3....4

%e ..5....5....2....4....5....4....5....5....4....5....1....5....4....5....4....5

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

%e ..6....3....6....6....6....6....6....2....6....4....6....3....6....1....6....6

%K nonn

%O 1,2

%A _R. H. Hardin_ May 23 2011