%I #4 Aug 24 2015 10:57:00
%S 80,132,269,484,871,1702,3230,6084,11656,22140,41998,80163,152575,
%T 290154,552862,1052566,2003661,3815643,7265371,13832801,26339615,
%U 50153430,95494793,181830620,346224829,659237773,1255247777,2390111154,4550973946
%N Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001011.
%C Column 2 of A261553.
%H R. H. Hardin, <a href="/A261549/b261549.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 2*a(n-2) +3*a(n-3) +a(n-4) -a(n-5) +a(n-6) -2*a(n-7) -2*a(n-8) -3*a(n-9) +2*a(n-10) -a(n-11) -7*a(n-12) +3*a(n-13) -4*a(n-14) -2*a(n-15) +2*a(n-16) for n>17
%e Some solutions for n=4
%e ..0..0..0..1....1..0..0..1....0..1..0..1....1..1..0..1....0..0..0..0
%e ..0..0..0..0....0..0..0..0....0..0..0..1....0..0..0..0....0..0..0..1
%e ..1..0..0..1....1..0..0..1....0..0..0..0....1..0..0..0....1..0..0..0
%e ..0..0..0..0....0..0..0..0....1..0..0..0....0..0..0..1....0..0..0..0
%e ..0..0..0..0....1..0..0..1....0..0..0..1....0..0..0..0....1..0..0..1
%e ..1..0..0..1....0..0..0..0....1..0..0..0....1..0..1..1....1..0..1..0
%Y Cf. A261553.
%K nonn
%O 1,1
%A _R. H. Hardin_, Aug 24 2015