%I #6 Apr 28 2023 13:55:48

%S 39,1473,143183,46727365,45610599689,147068094657177,

%T 1487588729246707713,48486777403751460298381,

%U 5004721415407427603880128041

%N Number of (n+1) X (n+1) 0..2 arrays with the upper median equal to the lower median in every 2 X 2 subblock.

%C Diagonal of A235981.

%e Some solutions for n=3

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

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

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

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

%Y Cf. A235981.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 17 2014