A222321 - OEIS

%I #5 Dec 18 2015 18:18:27

%S 1,0,4,52,674,38238,2284728,620488671,174162198742,206752746752932

%N Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one king-move neighbor, with new values introduced in row major 0..1 order

%C Diagonal of A222328

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,3

%A _R. H. Hardin_ Feb 15 2013