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A201346 Number of n X n 0..1 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor 0
0, 4, 18, 191, 4860, 310036, 53350918, 26097731070, 37211940860240, 157260419809121989 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A201353

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=5

..0..0..0..0..1....0..0..0..1..1....0..0..0..1..1....0..0..0..0..1

..0..0..0..1..1....0..0..1..0..0....0..0..0..1..1....0..0..1..1..1

..0..1..1..0..0....0..0..1..0..0....0..0..1..1..1....0..1..0..1..1

..1..0..1..0..0....0..0..1..0..0....0..0..1..1..1....1..1..0..1..0

..1..0..1..1..1....0..0..1..0..0....0..1..1..0..0....1..1..0..1..0

CROSSREFS

Sequence in context: A058924 A260970 A154731 * A174663 A197786 A242083

Adjacent sequences:  A201343 A201344 A201345 * A201347 A201348 A201349

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 30 2011

STATUS

approved

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Last modified September 20 10:10 EDT 2019. Contains 327229 sequences. (Running on oeis4.)