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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
1

%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