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Number of nX4 arrays of permutations of 4 copies of 0..n-1 with rows and columns nondecreasing.
0

%I #3 Nov 29 2015 16:06:24

%S 1,3,14,112,1095,13009,175865,2647438,43347498,760869739,14150265025,

%T 276374334318,5629364791202

%N Number of nX4 arrays of permutations of 4 copies of 0..n-1 with rows and columns nondecreasing.

%C Column 4 of A265005.

%e Some solutions for n=4

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

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

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

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

%Y Cf. A265005.

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 29 2015