A251220 - OEIS

%I #5 Nov 30 2014 20:36:23

%S 14,305,20782,4462968,3007738372,6373427948731,42432102644410392,

%T 887822645668106069016,58374742677350528694024651,

%U 12061621459257582136492647314788,7831831916823870434473136772446378463

%N Number of (n+1)X(n+1) 0..1 arrays with no 2X2 subblock having the minimum of its diagonal elements greater than the absolute difference of its antidiagonal elements

%C Diagonal of A251228

%H R. H. Hardin, <a href="/A251220/b251220.txt">Table of n, a(n) for n = 1..15</a>

%e Some solutions for n=3

%e ..1..0..0..1....1..0..1..0....1..1..0..0....0..1..1..0....1..1..1..0

%e ..1..0..0..1....0..0..1..1....0..1..0..1....1..0..1..0....1..0..1..1

%e ..0..0..0..1....0..0..0..0....0..1..1..1....1..1..1..1....0..0..0..1

%e ..0..0..0..0....1..1..0..1....0..0..0..1....0..0..1..0....1..0..1..1

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 30 2014