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A248838 Number of length n arrays x(i), i=1..n with x(i) in 0..i and no value appearing more than 4 times 2

%I

%S 2,6,24,120,718,4994,39556,351320,3456742,37314126,438366374,

%T 5567209930,75995663398,1109556555434,17252609166736,284620418911180,

%U 4965138989585412,91317809653363376,1765937111915469414

%N Number of length n arrays x(i), i=1..n with x(i) in 0..i and no value appearing more than 4 times

%C Column 4 of A248842

%H R. H. Hardin, <a href="/A248838/b248838.txt">Table of n, a(n) for n = 1..196</a>

%e Some solutions for n=6

%e ..0....1....1....1....0....0....1....0....0....1....0....1....1....0....1....1

%e ..0....2....2....0....0....2....0....2....2....0....2....1....1....2....0....1

%e ..3....2....2....0....2....2....3....2....0....3....1....0....2....2....1....3

%e ..3....0....3....3....3....2....1....2....0....0....0....4....0....1....0....0

%e ..0....5....0....2....2....1....2....2....4....3....2....0....5....4....1....1

%e ..3....4....5....1....6....5....5....5....6....2....1....1....5....4....0....2

%K nonn

%O 1,1

%A _R. H. Hardin_, Oct 15 2014

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Last modified January 27 06:42 EST 2023. Contains 359837 sequences. (Running on oeis4.)