A203957 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) such that rows of b(i,j) and columns of c(i,j) are lexicographically nondecreasing

32, 851, 144184, 157316750, 1111763853732, 50733485047025530, 15590622229636053238362

Offset

1,1

Comments

Diagonal of A203965

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A139677 A231161 A220460 * A301839 A302067 A281474

Adjacent sequences: A203954 A203955 A203956 * A203958 A203959 A203960

Keyword

nonn

Author

R. H. Hardin Jan 08 2012

Status

approved