A184188 - OEIS

%I #6 Mar 31 2012 12:35:56

%S 6,104,5074,723635,294738261,345350598641,1159953545419800,

%T 11179084602659460821,309007688117388883362756,

%U 24500703075201459753727015848,5572033834554753242178727061445289

%N Half the number of (n+1)X(n+1) binary arrays with no 2X2 subblock containing exactly one 1

%C Diagonal of A184197

%H R. H. Hardin, <a href="/A184188/b184188.txt">Table of n, a(n) for n = 1..14</a>

%e Some solutions for 3X3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 10 2011