A219464 - OEIS

%I #5 Dec 18 2015 18:18:21

%S 4,23,673,87083,43792361,86755752059,664221777830589

%N Number of n X n arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 n X n array

%C Diagonal of A219471

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Nov 20 2012