A203596 - OEIS

%I #4 Mar 31 2012 12:36:57

%S 18,46,172,1430,17452,225034,3278068,44996822,678210234,10630860542,

%T 166229546776,2711212581278,44274361678950

%N Number of nX3 0..2 arrays with the counts of all possible adjacent horizontal and vertical pair sum values being within one of each other

%C Column 3 of A203600

%e Some solutions for n=5

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 03 2012