A206988 Number of n X n 0..1 arrays avoiding 0 0 0 horizontally and 1 1 1 vertically

2, 16, 174, 6510, 516724, 88819714, 37849652838, 36679559167444, 82039130470188394, 429029852979061855882, 5194153238714571994969836, 145816870651378340099973452074

Offset

1,1

Comments

Diagonal of A206994

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Sequence in context: A355408 A367384 A138014 * A217360 A371669 A363311

Adjacent sequences: A206985 A206986 A206987 * A206989 A206990 A206991

Keyword

nonn

Author

R. H. Hardin Feb 14 2012

Status

approved