A203180 Number of nX7 0..2 arrays with every 1 immediately preceded by 0 to the left or above, no 0 immediately preceded by a 0, and every 2 immediately preceded by 0 1 to the left or above

5, 18, 235, 2466, 23083, 223567, 2208945, 22411843, 216858412, 2141041521, 21294389765, 209517628754, 2070288232686, 20420464639642, 201913230471755, 1993188902599209, 19665745111235770, 194376407794905718

Offset

1,1

Comments

Column 7 of A203181

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=5
..0..1..2..0..1..0..1....0..1..0..1..2..0..1....0..1..0..1..2..0..1
..1..0..1..2..0..1..0....1..0..1..2..0..1..0....1..0..1..0..1..2..0
..0..1..0..1..1..2..1....0..1..0..1..1..0..1....0..1..0..1..2..0..1
..1..0..1..0..1..0..1....1..0..1..0..2..1..2....1..2..1..2..0..1..0
..0..1..2..1..0..1..0....2..1..0..1..2..0..1....0..1..0..1..1..0..1

Crossrefs

Sequence in context: A291356 A091059 A352663 * A359616 A359560 A139243

Adjacent sequences: A203177 A203178 A203179 * A203181 A203182 A203183

Keyword

nonn

Author

R. H. Hardin Dec 30 2011

Status

approved