A203445 Number of (n+1)X(n+1) 0..1 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

8, 34, 321, 7481, 554620, 125140148, 91479447926, 216607480473481, 1675743278510590472, 42706348945332757503203

Offset

1,1

Comments

Diagonal of A203452

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A229398 A223015 A222796 * A318244 A280395 A158991

Adjacent sequences: A203442 A203443 A203444 * A203446 A203447 A203448

Keyword

nonn

Author

R. H. Hardin Jan 02 2012

Status

approved