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%I #5 Nov 30 2014 18:27:13
%S 10,86,1654,73170,7392190,1688254298,871573835362,1016396169840162,
%T 2677928828235940878,15939286491629789077436,
%U 214333474893685389914820434,6511102783725658099829377229314,446854251204340727817177223022169346
%N Number of (n+1)X(n+1) 0..1 arrays with no 2X2 subblock having the minimum of its diagonal elements less than the absolute difference of its antidiagonal elements
%C Diagonal of A251201
%H R. H. Hardin, <a href="/A251193/b251193.txt">Table of n, a(n) for n = 1..20</a>
%e Some solutions for n=4
%e ..0..1..1..1..1....1..1..0..1..0....0..1..0..1..1....0..1..1..1..0
%e ..1..1..1..0..1....1..0..1..1..1....1..0..1..0..1....1..1..1..0..1
%e ..1..1..1..1..1....1..1..0..1..0....0..1..1..1..0....1..1..0..1..0
%e ..1..1..1..1..1....1..1..1..0..1....1..0..1..1..1....1..0..1..0..0
%e ..1..1..1..1..0....0..1..0..1..1....1..1..0..1..1....1..1..0..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 30 2014