A223658 Number of n X n 0..3 arrays with row sums unimodal and column sums inverted unimodal

4, 256, 141046, 761845474, 44626165058452

Offset

1,1

Comments

Diagonal of A223663

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A223795 A207275 A207473 * A207529 A206968 A206789

Adjacent sequences: A223655 A223656 A223657 * A223659 A223660 A223661

Keyword

nonn

Author

R. H. Hardin Mar 25 2013

Status

approved