A199249 - OEIS

%I #7 Dec 18 2015 18:17:54

%S 1,1,114,11223,68639138,208100267703

%N Number of n X n 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and no element equal to any horizontal or vertical neighbor

%C Diagonal of A199256

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,3

%A _R. H. Hardin_ Nov 04 2011