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%I #4 Aug 06 2015 11:12:48
%S 91,133,239,481,925,1873,3683,7321,14439,28529,56363,111523,220633,
%T 436539,863261,1707243,3376067,6677245,13206405,26120525,51660959,
%U 102173689,202075167,399659881,790442205,1563330291,3091935925
%N Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101
%C Column 2 of A260980
%H R. H. Hardin, <a href="/A260974/b260974.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 2*a(n-2) +2*a(n-3) +a(n-4) +2*a(n-5) +6*a(n-6) +5*a(n-7) -3*a(n-8) -9*a(n-9) -8*a(n-10) -5*a(n-11) for n>14
%e Some solutions for n=4
%e ..0..1..0..0....0..0..1..0....1..0..0..0....0..0..0..1....0..0..0..0
%e ..0..0..0..1....0..1..0..0....0..0..1..0....0..1..0..0....0..0..1..0
%e ..1..0..0..0....0..0..0..1....1..0..0..1....1..0..0..0....1..0..0..1
%e ..0..0..1..0....1..0..0..0....0..1..0..0....0..0..1..0....0..1..0..0
%e ..1..0..0..1....0..0..1..0....0..0..0..0....0..0..0..1....0..0..0..0
%e ..0..1..0..0....0..0..0..1....1..0..0..0....0..1..0..0....1..0..1..0
%Y Cf. A260980
%K nonn
%O 1,1
%A _R. H. Hardin_, Aug 06 2015
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