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A201270 Number of n X n 0..2 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other 0
3, 5, 7, 85, 556, 1260, 27008, 215577, 613916, 16442049, 152673459, 487975060, 14392411292, 144918917509, 496264541787, 15559415313705, 165127072154120, 592098075114238 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A201277

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

Some solutions for n=5

..0..0..0..0..2....0..0..0..0..2....0..0..0..0..0....0..0..0..0..0

..0..0..1..2..2....0..0..1..1..2....0..0..0..1..1....0..0..1..2..2

..0..1..1..2..2....0..1..1..2..2....1..1..1..1..1....0..1..1..2..2

..0..1..1..2..2....0..1..1..2..2....1..2..2..2..2....1..1..1..2..2

..1..1..1..2..2....1..1..1..2..2....2..2..2..2..2....1..1..1..2..2

CROSSREFS

Sequence in context: A306573 A254925 A153138 * A160360 A082697 A051345

Adjacent sequences:  A201267 A201268 A201269 * A201271 A201272 A201273

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 29 2011

STATUS

approved

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Last modified July 13 04:01 EDT 2020. Contains 335673 sequences. (Running on oeis4.)