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%I #4 Jul 26 2015 17:58:39
%S 49,92,213,471,1085,2562,5891,13530,31372,72451,166919,385563,890572,
%T 2054927,4743628,10953016,25283529,58363941,134740753,311052242,
%U 718052661,1657646568,3826724610,8834001277,20393409965,47078589297
%N Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010101
%C Column 2 of A260475
%H R. H. Hardin, <a href="/A260469/b260469.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = a(n-1) +a(n-2) +5*a(n-3) +a(n-4) -3*a(n-5) -3*a(n-6) +a(n-7) +2*a(n-8) -a(n-9) -5*a(n-10) -5*a(n-11) -2*a(n-15) -2*a(n-16) for n>17
%e Some solutions for n=4
%e ..0..0..0..0....0..0..0..1....0..0..0..0....0..0..0..1....0..0..0..1
%e ..1..0..0..1....1..0..0..0....0..0..0..1....1..0..0..0....0..0..1..0
%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..1....0..0..0..0
%e ..0..0..0..1....0..0..1..0....0..0..0..0....0..0..0..0....1..0..0..0
%e ..0..0..0..0....0..0..0..0....0..0..0..1....0..1..0..1....0..0..0..1
%Y Cf. A260475
%K nonn
%O 1,1
%A _R. H. Hardin_, Jul 26 2015
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