%I #6 Dec 18 2015 18:17:55
%S 4,2,52,112,4544,16334,1129682,5464208,458459214,2605975384,
%T 253569083138,1617730690396
%N Number of n X n 0..3 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other
%C Diagonal of A201451
%e Some solutions for n=6
%e ..0..0..0..0..0..1....0..0..0..0..1..1....0..0..0..1..2..2....0..0..0..0..1..1
%e ..0..0..1..2..2..2....0..0..0..0..1..1....0..0..1..1..2..3....0..0..0..0..2..2
%e ..0..0..1..2..3..3....0..1..1..1..1..1....0..1..1..2..2..3....0..1..1..1..2..2
%e ..1..1..2..2..3..3....2..2..2..2..2..3....0..1..1..2..2..3....1..1..2..2..2..2
%e ..1..1..2..2..3..3....2..2..2..3..3..3....0..1..1..2..2..3....1..1..2..3..3..3
%e ..1..1..2..3..3..3....2..3..3..3..3..3....0..3..3..3..3..3....3..3..3..3..3..3
%K nonn
%O 1,1
%A _R. H. Hardin_ Dec 01 2011