The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #5 Apr 21 2021 14:20:00
%S 268448,52510194,9225012664,1441675265430,209596416266780,
%T 28196902285660542,3557678832961970242,421909777278978907348,
%U 47357147640683100682322,5051663776188302152122470
%N Number of (4+1) X (n+1) 0..3 arrays with the difference of the upper and lower median value of each 2 X 2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise.
%C Row 4 of A235818.
%e Some solutions for n=1
%e ..0..0....2..0....0..1....2..0....0..1....2..0....2..0....0..2....0..0....2..2
%e ..2..3....1..0....0..2....1..2....2..3....1..2....2..1....1..0....2..3....0..0
%e ..1..3....2..0....2..1....3..0....0..1....3..0....2..1....1..0....3..0....3..2
%e ..1..0....3..1....2..0....3..3....1..1....0..0....2..1....2..2....2..3....1..1
%e ..1..3....2..0....1..3....1..3....1..1....0..0....1..0....1..2....2..2....2..3
%Y Cf. A235818.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 16 2014