A207236 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 0 vertically.

2, 16, 102, 987, 13876, 197256, 3510185, 71594896, 1760487825, 47844199134, 1511863246821, 57304254157049, 2367852660685470, 115523120639939042, 6698200226978686505, 429360115542695358515, 32711874875890241470483

Offset

1,1

Comments

Diagonal of A207242.

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

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

Crossrefs

Cf. A207242.

Sequence in context: A208033 A208159 A208282 * A207955 A207494 A207117

Adjacent sequences: A207233 A207234 A207235 * A207237 A207238 A207239

Keyword

nonn

Author

R. H. Hardin, Feb 16 2012

Status

approved