A203356 Number of n X n binary arrays with every 1 immediately preceded by 0 to the left or above.

1, 7, 102, 5677, 984703, 572818585, 1089970014327, 6842701992875869, 141313097261182627960, 9609805102278645983838526, 2151172274505675499995093835341, 1585313606427874519807992162372572320

Offset: 1

Author

R. H. Hardin Dec 31 2011

Keywords

• nonn

Comments

Diagonal of A203362

Examples

			Some solutions for n=4
..0..0..1..0....0..1..0..1....0..0..1..0....0..1..0..0....0..1..0..0
..0..1..0..1....0..1..1..0....0..0..0..1....0..1..0..1....0..1..0..1
..0..0..0..0....0..0..0..1....1..0..0..1....0..1..0..0....0..0..0..1
..1..1..0..0....0..1..0..1....0..1..1..0....0..0..0..1....0..0..1..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..22