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%I #4 Aug 04 2015 07:35:52
%S 186,279,896,2208,4522,10617,25690,58606,134296,314471,729920,1686078,
%T 3909750,9081515,21033032,48765365,113054330,262238504,607643220,
%U 1409411303,3266491942,7576260468,17557722330,40724481666,94379231110
%N Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101
%C Column 4 of A260927
%H R. H. Hardin, <a href="/A260923/b260923.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = a(n-2) +18*a(n-4) +32*a(n-6) -7*a(n-8) -33*a(n-10) +13*a(n-12) +25*a(n-14) -28*a(n-16) +9*a(n-18) -a(n-20) for n>22
%e Some solutions for n=4
%e ..0..0..1..0..1..0....1..0..0..1..1..0....1..0..0..1..0..1....0..1..0..1..1..0
%e ..0..1..0..0..0..1....1..0..1..0..0..0....1..0..1..0..0..0....1..0..1..0..0..0
%e ..1..0..1..0..1..0....0..1..0..1..0..1....0..1..0..1..0..1....0..1..0..1..0..1
%e ..0..1..0..1..0..1....1..0..1..0..1..0....1..0..1..0..1..0....1..0..1..0..1..0
%e ..0..0..1..0..1..0....0..0..0..1..0..1....0..1..0..1..0..1....0..1..0..1..0..1
%e ..1..1..0..1..0..1....0..1..1..0..0..1....1..0..1..0..0..1....0..0..1..0..1..0
%Y Cf. A260927
%K nonn
%O 1,1
%A _R. H. Hardin_, Aug 04 2015
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