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%I #5 Jul 02 2015 08:27:19
%S 18,64,581,4146,44500,899557,19848497,593505391,28804661988,
%T 1803294030851,150215435682396,18581117366931470,3161106877662837437,
%U 725638805668965032687,236686439674936087627391
%N Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 or 00000001
%C Diagonal of A259642
%H R. H. Hardin, <a href="/A259634/b259634.txt">Table of n, a(n) for n = 1..18</a>
%e Some solutions for n=4
%e ..0..0..0..0..0..0....1..0..0..0..0..0....1..0..0..0..1..0....0..1..0..0..0..1
%e ..0..1..0..0..1..0....0..0..0..0..1..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..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..0..0..1....0..0..0..0..0..0
%e ..0..1..0..0..0..0....0..0..0..1..0..0....0..0..0..0..0..0....0..0..0..0..1..0
%e ..1..0..0..0..1..0....1..0..0..0..0..0....0..1..0..0..0..0....0..0..0..0..0..0
%Y Cf. A259642
%K nonn
%O 1,1
%A _R. H. Hardin_, Jul 02 2015
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