A229772 Number of n X n 0..4 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order

5, 135, 21331, 35452250, 843211336888, 322942973130396495, 2131384087795458774515411

Offset

1,1

Comments

Column 4 of A229774

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=3
..3..3..1....1..1..0....3..2..0....0..0..0....3..1..1....2..1..1....2..1..1
..3..3..4....4..2..3....4..3..2....3..2..1....4..4..2....4..1..1....4..3..1
..4..3..0....4..3..2....4..4..0....3..4..3....4..4..4....4..3..3....4..4..4

Crossrefs

Sequence in context: A215218 A159355 A184577 * A082212 A208867 A094808

Adjacent sequences: A229769 A229770 A229771 * A229773 A229774 A229775

Keyword

nonn

Author

R. H. Hardin, Sep 29 2013

Status

approved