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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 January 27 21:50 EST 2020. Contains 331300 sequences. (Running on oeis4.)