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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 (list; graph; refs; listen; history; text; internal format)
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: A103914 A211039 A266483 * A218887 A001535 A300136

Adjacent sequences:  A203361 A203362 A203363 * A203365 A203366 A203367

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 31 2011

STATUS

approved

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Last modified April 21 10:30 EDT 2019. Contains 322328 sequences. (Running on oeis4.)