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A201532 Number of n X n 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor 0
0, 9, 111, 7799, 2446147, 3762507339, 28456420346436 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A201539
LINKS
EXAMPLE
Some solutions for n=4
..0..0..0..1....0..1..1..1....0..0..0..0....0..0..2..2....0..0..0..2
..0..0..0..1....0..1..2..2....0..1..2..2....0..0..2..2....0..1..2..2
..0..0..0..1....0..1..2..2....0..1..2..2....1..1..2..2....2..1..1..1
..0..0..1..1....2..2..2..2....1..1..2..2....2..2..1..1....2..2..2..1
CROSSREFS
Sequence in context: A082723 A352384 A143167 * A180788 A348068 A241804
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 02 2011
STATUS
approved

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Last modified March 29 11:45 EDT 2024. Contains 371278 sequences. (Running on oeis4.)