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Number of nX2 0..3 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order
1

%I #5 Feb 26 2013 08:28:00

%S 1,1,3,12,40,149,615,2659,11641,51672,231598,1044550,4729221,21473854,

%T 97727797,445587611,2034814173,9304775285,42600153350,195249156987,

%U 895771869115,4113392176083,18904548916567,86949854091897

%N Number of nX2 0..3 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order

%C Column 2 of A222616

%H R. H. Hardin, <a href="/A222610/b222610.txt">Table of n, a(n) for n = 1..210</a>

%e All solutions for n=3

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

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

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

%K nonn

%O 1,3

%A _R. H. Hardin_ Feb 26 2013