A223926 Number of n X n 0..2 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing

3, 54, 1116, 21334, 386495, 6621074, 108796955, 1735753333, 27144561576

Offset

1,1

Comments

Diagonal of A223933

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A374522 A182159 A065102 * A003776 A222203 A224051

Adjacent sequences: A223923 A223924 A223925 * A223927 A223928 A223929

Keyword

nonn

Author

R. H. Hardin Mar 29 2013

Status

approved