A203364 Number of n X n 0..2 arrays with every 1 immediately preceded by 0 to the left or above, and every 2 immediately preceded by both a 1 and a 0

1, 9, 206, 25087, 12450511, 27758308569, 268596415269518, 11418407989258386063, 2123416290057435139377984, 1730027601945756966270290770899, 6171982920189881996353564499776171963

Offset

1,2

Comments

Diagonal of A203371

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

Some solutions for n=4
..0..0..0..0....0..0..1..0....0..0..1..0....0..0..0..1....0..0..0..0
..1..2..0..0....0..1..0..0....0..0..2..0....0..0..1..0....0..1..2..0
..0..0..1..1....1..0..1..0....0..0..0..1....0..0..1..1....1..0..0..0
..1..2..0..1....0..1..0..0....0..1..2..0....0..0..0..1....0..1..1..2

Crossrefs

Sequence in context: A211039 A307735 A266483 * A218887 A001535 A300136

Adjacent sequences: A203361 A203362 A203363 * A203365 A203366 A203367

Keyword

nonn

Author

R. H. Hardin Dec 31 2011

Status

approved