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A223771 Number of n X n 0..1 arrays with rows and columns unimodal and antidiagonals nondecreasing 0
2, 12, 78, 461, 2516, 12975, 64256, 308895, 1451996, 6707709, 30563338, 137715999, 614855772, 2724027619 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A223777
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0....0..0..0....1..0..0....0..0..1....0..0..0....0..0..0....0..0..0
..1..0..0....0..0..0....1..1..0....1..1..1....1..1..0....1..0..0....0..0..0
..1..0..0....1..0..0....1..1..1....1..1..1....1..1..0....0..0..1....0..1..1
CROSSREFS
Sequence in context: A372410 A372233 A081014 * A370442 A062871 A306272
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 27 2013
STATUS
approved

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Last modified May 29 20:46 EDT 2024. Contains 372952 sequences. (Running on oeis4.)