%I #6 Dec 18 2015 18:17:57
%S 1,3,32,1177,146300,60758779,83834499040,383108603365234,
%T 5786835759666959842,288547665952004154207686,
%U 47452156644340908611972658594,25719338921489550833572201554228792
%N Number of n X n nonnegative integer arrays with each row and column increasing from zero by 0, 1 or 2
%C Diagonal of A202812
%e Some solutions for n=4
%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
%e ..0..0..0..0....0..0..0..0....0..0..0..1....0..0..0..2....0..0..1..2
%e ..0..0..0..0....0..0..0..2....0..0..2..2....0..1..2..2....0..0..1..3
%e ..0..1..1..1....0..0..1..2....0..2..2..2....0..1..3..3....0..2..3..5
%K nonn
%O 1,2
%A _R. H. Hardin_ Dec 24 2011