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%I #4 Oct 15 2014 14:46:56
%S 2,6,24,120,720,5040,40320,362878,3628706,39913932,478928016,
%T 6225275778,87138262602,1306763837486,20901947961712,355203011199460,
%U 6390875986594862,121365402664456728,2425912530967520904
%N Number of length n arrays x(i), i=1..n with x(i) in 0..i and no value appearing more than 7 times
%C Column 7 of A248842
%H R. H. Hardin, <a href="/A248841/b248841.txt">Table of n, a(n) for n = 1..95</a>
%e Some solutions for n=6
%e ..1....0....1....1....0....1....1....0....1....1....1....0....0....1....0....0
%e ..0....2....2....2....1....1....1....2....0....1....0....1....0....1....2....0
%e ..1....2....3....3....0....3....1....2....2....3....1....3....0....2....3....0
%e ..2....3....3....4....0....0....0....3....0....2....3....1....3....3....2....3
%e ..0....1....1....0....4....1....4....2....3....4....1....2....0....3....1....5
%e ..1....5....2....3....3....6....6....5....0....4....0....2....0....2....6....0
%K nonn
%O 1,1
%A _R. H. Hardin_, Oct 15 2014