A222683 - OEIS

A222683

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

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

%S 1,3,32,3189,419562,589802909,832227066041,12257277646565165,

%T 179723518209287846721,27075363282358942396191388

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

%C Diagonal of A222690

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 28 2013