A229771 Number of n X n 0..3 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order

4, 60, 3232, 1058494, 3062815568, 90462380211862, 29201160476766771330, 108134253835820664368578112

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 * A341275 A338550 A340937

Adjacent sequences: A229768 A229769 A229770 * A229772 A229773 A229774

Keyword

nonn

Author

R. H. Hardin, Sep 29 2013

Status

approved