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A222449 Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..1 order 0

%I

%S 1,0,2,101,1847,161779,17977932,8774928190,4427986390487,

%T 10016765131595843

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

%C Diagonal of A222456

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,3

%A _R. H. Hardin_ Feb 20 2013

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Last modified January 29 14:23 EST 2020. Contains 331338 sequences. (Running on oeis4.)