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%I #4 Mar 31 2012 12:36:38
%S 1,7,25,107,381,1589,5153,18809,68813,256859,883247,4997167,12448095,
%T 76804553,181129817,522024177,1884097881,16163873397,38888615377,
%U 239811969005
%N Number of 0..6 arrays x(0..n-1) of n elements with zero n-1st difference
%C Column 6 of A200154
%e Some solutions for n=6
%e ..1....1....6....5....5....3....5....0....0....0....6....2....0....4....2....5
%e ..6....4....6....4....1....4....6....0....6....2....6....6....2....4....2....2
%e ..2....2....5....4....2....0....3....2....3....3....4....6....0....4....2....2
%e ..0....2....3....4....3....1....2....2....2....3....2....6....2....3....4....1
%e ..3....4....2....4....3....6....4....0....4....3....2....6....6....2....6....0
%e ..6....1....6....5....5....3....5....0....0....5....6....2....0....4....2....5
%K nonn
%O 1,2
%A _R. H. Hardin_ Nov 13 2011
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