A203401 Number of (n+2)X(n+2) binary arrays avoiding patterns 000 and 111 in rows and columns

102, 2030, 60232, 3858082, 446672706, 101578277384, 43680343039806, 36133311325799774, 57061338836892846628, 172603583392706027305210

Offset

1,1

Comments

Diagonal of A203407

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=3
..1..0..1..0..0....0..1..0..1..0....1..0..0..1..0....1..0..0..1..0
..1..0..0..1..0....0..0..1..0..0....0..0..1..0..0....0..1..1..0..1
..0..1..1..0..1....1..1..0..1..1....1..1..0..1..1....1..0..1..0..1
..1..0..1..0..0....0..0..1..0..0....0..1..1..0..0....0..1..0..1..0
..0..1..0..1..0....1..0..1..1..0....0..0..1..0..1....1..0..1..1..0

Crossrefs

Sequence in context: A163435 A223308 A230737 * A217331 A284448 A274252

Adjacent sequences: A203398 A203399 A203400 * A203402 A203403 A203404

Keyword

nonn

Author

R. H. Hardin Jan 01 2012

Status

approved