login
Number of n X n 0..3 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order
1

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

%S 4,60,3232,1058494,3062815568,90462380211862,29201160476766771330,

%T 108134253835820664368578112

%N Number of n X n 0..3 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order

%C Column 3 of A229774

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Sep 29 2013