A207912 Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 0 and 0 1 1 vertically

25, 625, 2625, 11025, 110775, 1113025, 6835345, 41977441, 336253621, 2693506201, 18577402747, 128130350209, 960194962333, 7195597016521, 51458156348129, 367994740209721, 2701833829557059, 19836984730756561, 143485534654475891

Offset

1,1

Comments

Row 7 of A207908

Links

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

Example

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

Crossrefs

Sequence in context: A207268 A208106 A207727 * A208424 A207784 A207597

Adjacent sequences: A207909 A207910 A207911 * A207913 A207914 A207915

Keyword

nonn

Author

R. H. Hardin Feb 21 2012

Status

approved