A203037 - OEIS

%I #6 Mar 31 2012 12:36:54

%S 4,20228,77256180,539443637988,4274880689220682

%N Number of 7Xn 0..3 arrays with row sums equal and column sums unequal to adjacent columns

%C Row 7 of A203031

%e Some.solutions.for.n=4

%e ..0..1..3..0....1..0..0..1....2..2..1..1....0..0..0..3....2..0..3..0

%e ..1..2..0..1....0..2..0..0....2..0..1..3....0..1..1..1....0..2..1..2

%e ..1..3..0..0....1..1..0..0....2..3..0..1....0..2..0..1....0..2..1..2

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

%e ..0..3..0..1....0..0..2..0....2..2..1..1....1..0..0..2....1..0..3..1

%e ..1..3..0..0....1..0..0..1....0..2..1..3....1..1..1..0....0..1..1..3

%e ..3..0..0..1....0..0..2..0....1..2..0..3....2..0..0..1....1..2..0..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 27 2011