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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
1, 9, 206, 25087, 12450511, 27758308569, 268596415269518, 11418407989258386063, 2123416290057435139377984, 1730027601945756966270290770899, 6171982920189881996353564499776171963
OFFSET
1,2
COMMENTS
Diagonal of A203371
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 31 2011
STATUS
approved