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%I #5 Nov 15 2013 19:28:59
%S 4,142,14842,6517534,11501370840,80362090509378,2227569337736429246,
%T 245123750599446294788488,107075160540284607946778623864,
%U 185664549157140167132223088015356148
%N Number of (n+1)X(n+1) 0..1 arrays with every element equal to some horizontal, vertical, diagonal or antidiagonal neighbor, with top left element zero
%C Diagonal of A231957
%H R. H. Hardin, <a href="/A231949/b231949.txt">Table of n, a(n) for n = 1..12</a>
%e Some solutions for n=3
%e ..0..1..1..1....0..0..0..0....0..1..1..0....0..1..1..0....0..1..1..1
%e ..0..0..0..1....1..0..0..1....0..0..0..1....1..0..0..1....1..0..0..0
%e ..1..1..1..0....0..1..0..1....1..1..1..1....1..1..0..1....0..1..1..0
%e ..1..1..0..1....1..1..0..0....1..1..0..0....1..0..1..0....0..0..0..1
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 15 2013
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