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A202544 Number of n X n nonnegative integer arrays with each row and column an ascent sequence (interior element no greater than one plus up-steps preceding it) 0
1, 2, 18, 1094, 658492, 5534917394, 876480920594230, 3399581643395993926522 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A202549

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=5

..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0

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

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

..0..0..1..2..1....0..0..1..2..3....0..1..1..0..1....0..0..1..1..1

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

CROSSREFS

Sequence in context: A013040 A268051 A268074 * A203421 A139111 A090766

Adjacent sequences:  A202541 A202542 A202543 * A202545 A202546 A202547

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 20 2011

STATUS

approved

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Last modified July 9 16:50 EDT 2020. Contains 335545 sequences. (Running on oeis4.)