A224368 Number of n X n 0..2 arrays with rows unimodal and antidiagonals nondecreasing

3, 54, 1838, 77793, 3607078, 174854516, 8684742989, 437757725110, 22283207886650, 1142441203546438, 58904154561219603, 3051594326913582293, 158760240705250821719, 8291742411017787312243, 434658935860309950718887

Offset

1,1

Comments

Diagonal of A224374

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

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

Crossrefs

Sequence in context: A224304 A266523 A157550 * A091826 A091796 A171213

Adjacent sequences: A224365 A224366 A224367 * A224369 A224370 A224371

Keyword

nonn

Author

R. H. Hardin Apr 05 2013

Status

approved