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%I #5 Aug 13 2015 06:33:40
%S 36,52,288,1918,11733,85506,1062118,13599460,242945986,5120328922,
%T 155899484972,5208071829848,253966207382266,14042932506665452,
%U 1114055271066551642,99140006022295429922,12815515680476819645301
%N Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00100101 or 01010101.
%C Diagonal of A261265.
%H R. H. Hardin, <a href="/A261257/b261257.txt">Table of n, a(n) for n = 1..22</a>
%e Some solutions for n=4
%e ..0..1..0..1..0..0....0..1..0..0..0..1....0..0..0..1..0..1....1..0..1..0..0..0
%e ..0..0..1..0..1..0....0..0..1..0..1..0....1..0..1..0..0..0....0..0..0..1..0..1
%e ..0..1..0..1..0..1....0..1..0..1..0..1....0..1..0..1..0..1....1..0..1..0..1..0
%e ..1..0..1..0..1..0....1..0..1..0..1..0....1..0..1..0..1..0....0..1..0..1..0..1
%e ..0..1..0..1..0..1....0..0..0..1..0..0....0..0..0..1..0..0....0..0..1..0..1..0
%e ..1..0..1..0..0..0....0..0..1..0..1..0....1..0..1..0..0..1....1..0..0..1..0..1
%Y Cf. A261265.
%K nonn
%O 1,1
%A _R. H. Hardin_, Aug 13 2015
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