A203720 Number of (n+1)X(n+1) 0..2 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively

32, 480, 6249, 72777, 808455, 9149941, 108633030, 1362582726, 17889577522, 242706969233, 3365618287527, 47365931280277, 673677478328651, 9659756420132067, 139434264644779578, 2024155694575590620

Offset

1,1

Comments

Diagonal of A203728

Links

R. H. Hardin, Table of n, a(n) for n = 1..22

Example

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

Crossrefs

Sequence in context: A319307 A022069 A250560 * A306411 A085539 A091364

Adjacent sequences: A203717 A203718 A203719 * A203721 A203722 A203723

Keyword

nonn

Author

R. H. Hardin Jan 05 2012

Status

approved