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

1,2

Comments

Diagonal of A203362

Links

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

Example

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

Crossrefs

Sequence in context: A020477 A348887 A358159 * A346719 A223239 A140633

Adjacent sequences: A203353 A203354 A203355 * A203357 A203358 A203359

Keyword

nonn

Author

R. H. Hardin Dec 31 2011

Status

approved