A237549 - OEIS

%I #4 Feb 09 2014 06:40:40

%S 81,1668,60002,3207808,501667350,184415543478,177367882314550,

%T 366119804483636046,1978497544874844832642,25098928376580088624364564,

%U 821453000361180626304440936512

%N Number of (n+1)X(n+1) 0..2 arrays with the maximum minus the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

%C Diagonal of A237557

%e Some solutions for n=3

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 09 2014