A204077 - OEIS

%I #6 Dec 18 2015 18:17:59

%S 0,4,132,11236,13346532,94591923364,4337212764978412,

%T 1473512792354952891844

%N Number of n X n 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1

%C Diagonal of A204084

%e Some solutions for n=5

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 10 2012