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A201370
Number of n X n 0..1 arrays with rows and columns lexicographically nondecreasing read forwards, and nonincreasing read backwards
0
2, 3, 8, 36, 268, 3739, 115168, 8866257, 1799674094, 976134459840
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A201375
LINKS
Table of n, a(n) for n=1..10.
EXAMPLE
Some solutions for n=5
..0..1..1..1..1....0..0..0..0..1....0..1..1..1..1....0..0..1..1..1
..1..0..1..1..1....0..0..0..1..0....1..0..0..1..1....0..1..0..0..1
..1..1..0..0..1....0..1..1..0..0....1..0..0..1..1....0..1..1..1..0
..1..1..0..1..0....1..0..1..0..0....1..1..1..0..0....1..0..1..1..0
..1..1..1..0..0....1..1..0..0..0....1..1..1..0..0....1..1..0..0..0
CROSSREFS
Sequence in context: A191274 A041789 A174899 * A233532 A093908 A007119
Adjacent sequences: A201367 A201368 A201369 * A201371 A201372 A201373
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 30 2011
STATUS
approved

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Last modified September 30 07:15 EDT 2024. Contains 376325 sequences.
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