A203733 Number of (n+1)X(n+1) 0..3 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

90, 3912, 178836, 7927078, 325435792, 12852015708, 513715285322, 21463727483530, 946913403808620, 43905367195100872, 2117084835230553844, 105066513574419532846

Offset

1,1

Comments

Diagonal of A203741

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=4
..3..0..0..1..1....2..1..0..1..2....0..1..0..3..1....0..3..1..1..3
..0..3..3..3..3....1..2..3..3..3....2..1..2..1..3....2..1..3..3..3
..1..3..3..3..3....2..2..3..3..3....0..3..2..3..2....0..3..3..3..3
..2..3..3..3..3....3..3..3..3..3....1..2..3..2..3....1..3..3..3..3
..2..3..3..3..3....3..3..3..3..3....3..3..2..3..2....3..3..3..3..3

Crossrefs

Sequence in context: A013392 A013394 A013395 * A200208 A017806 A035740

Adjacent sequences: A203730 A203731 A203732 * A203734 A203735 A203736

Keyword

nonn

Author

R. H. Hardin Jan 05 2012

Status

approved