A203102 Number of n X n binary arrays with every 1 immediately preceded by 0 0 to the left or above

1, 1, 23, 592, 27930, 4984843, 2482513429, 3024912314764, 10252037660298200, 96894129507021776898, 2459526431235740649572096, 169397666939694686725348936336, 31898632588336093438359543528177154

Offset

1,3

Comments

Diagonal of A203108

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=5
..0..0..0..0..0....0..0..0..0..1....0..0..0..0..0....0..0..1..0..0
..0..0..0..0..0....0..0..0..0..1....0..0..0..1..0....0..0..0..0..0
..0..0..0..0..0....0..0..0..0..0....1..0..1..0..0....0..1..0..0..0
..0..1..1..1..0....1..0..1..1..0....0..0..1..0..0....0..0..1..0..1
..0..0..1..0..1....0..0..0..1..1....0..0..0..1..1....0..0..0..0..1

Crossrefs

Sequence in context: A043347 A015696 A106538 * A362482 A294995 A142750

Adjacent sequences: A203099 A203100 A203101 * A203103 A203104 A203105

Keyword

nonn

Author

R. H. Hardin Dec 29 2011

Status

approved