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A229771 Number of n X n 0..3 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order 1
4, 60, 3232, 1058494, 3062815568, 90462380211862, 29201160476766771330, 108134253835820664368578112 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A229774

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A177780 A012567 A132627 * A136385 A173607 A071582

Adjacent sequences:  A229768 A229769 A229770 * A229772 A229773 A229774

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 29 2013

STATUS

approved

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Last modified October 19 21:28 EDT 2019. Contains 328244 sequences. (Running on oeis4.)