|
%I #6 Mar 31 2012 12:37:02
%S 16,181,4901,313597,45645661,15468240213,11909737623605,
%T 21224284541503781,86355017921168786869,809181619551978590150053,
%U 17365790350293711986891075413,856356938035890178758703855462533
%N Number of (n+1)X(n+1) 0..1 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards
%C Diagonal of A204616
%H R. H. Hardin, <a href="/A204608/b204608.txt">Table of n, a(n) for n = 1..15</a>
%e Some solutions for n=4
%e ..1..0..1..0..0....1..0..0..0..0....1..1..1..1..0....0..1..0..1..1
%e ..0..0..0..0..0....1..0..1..0..1....1..1..1..1..0....1..1..0..1..1
%e ..0..1..0..0..0....1..0..1..0..1....1..1..1..1..0....1..1..0..1..1
%e ..0..1..0..1..0....0..0..0..0..0....0..0..0..0..0....1..1..0..1..1
%e ..0..1..0..1..0....1..1..1..1..0....1..0..1..1..1....1..1..0..0..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 17 2012
| 