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Number of n X n 0..4 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order
0

%I #4 Dec 18 2015 18:18:42

%S 5,135,21331,35452250,843211336888,322942973130396495,

%T 2131384087795458774515411

%N Number of n X n 0..4 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order

%C Column 4 of A229774

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Sep 29 2013