%I #5 Nov 28 2014 20:59:27
%S 15,392,36016,11633448,13211127617,52746349035592,740399698245965774,
%T 36539401198968631193728,6339835499950780464168370698,
%U 3867371786117427361119320198505328
%N Number of (n+1)X(n+1) 0..1 arrays with no 2X2 subblock having its maximum diagonal element less than its minimum antidiagonal element
%C Diagonal of A250956
%H R. H. Hardin, <a href="/A250950/b250950.txt">Table of n, a(n) for n = 1..19</a>
%e Some solutions for n=3
%e ..1..0..1..1....0..1..0..1....1..0..0..1....0..1..1..0....0..1..0..0
%e ..0..0..0..0....1..1..0..0....1..1..1..1....0..1..1..1....1..1..0..0
%e ..0..1..1..0....1..1..1..0....0..0..0..0....0..1..0..1....0..0..1..1
%e ..0..0..1..1....1..1..0..0....1..0..0..0....0..1..1..1....1..1..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 28 2014