|
%I #5 Dec 18 2015 18:17:42
%S 7,225,27834,14180874,29121196977,242376304739292,8162203076559295407
%N Number of n X n symmetric 0..6 arrays with no element equal to the product mod 7 of any two of its horizontal and vertical neighbors
%e Some solutions for 4X4
%e ..0..3..2..0....0..3..5..5....0..4..0..3....0..3..5..0....0..3..5..1
%e ..3..0..2..2....3..0..3..5....4..0..1..1....3..0..5..5....3..0..2..4
%e ..2..2..5..5....5..3..4..3....0..1..6..0....5..5..0..5....5..2..3..0
%e ..0..2..5..3....5..5..3..1....3..1..0..4....0..5..5..2....1..4..0..4
%K nonn
%O 1,1
%A _R. H. Hardin_ Jul 29 2011
| 