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A202729 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) and the lower right element equal to n-1 0
1, 1, 2, 12, 304, 44976, 51871384, 600608922384, 87357442179208880, 194354337721367202187520 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A202735

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A000178 A108395 A009669 * A012380 A012377 A012425

Adjacent sequences:  A202726 A202727 A202728 * A202730 A202731 A202732

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 23 2011

STATUS

approved

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Last modified October 23 16:15 EDT 2018. Contains 316529 sequences. (Running on oeis4.)