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%I #4 Aug 12 2016 07:05:15
%S 1,2,7,29,140,758,4448,27782,182322,1245399,8793649,63844600,
%T 474662243,3601895485,27823860424,218325937188,1737070192604
%N Number of nX3 arrays containing 3 copies of 0..n-1 with rows and columns nondecreasing.
%C Column 3 of A265005.
%e Some solutions for n=4
%e ..0..0..1....0..0..2....0..0..2....0..0..1....0..0..0....0..0..1....0..1..1
%e ..0..1..2....0..1..3....0..1..3....0..1..2....1..1..2....0..2..3....0..2..2
%e ..1..2..3....1..2..3....1..1..3....1..2..2....1..2..2....1..2..3....0..2..3
%e ..2..3..3....1..2..3....2..2..3....3..3..3....3..3..3....1..2..3....1..3..3
%Y Cf. A265005.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 29 2015