A203862 Number of (n+1)X(n+1) 0..4 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

205, 21635, 2935262, 443416660, 66135356129, 9455280188061, 1324162075797758, 188660753741911771, 28090704419759326277

Offset

1,1

Comments

Diagonal of A203870

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A077457 A060892 A359498 * A289333 A015289 A203888

Adjacent sequences: A203859 A203860 A203861 * A203863 A203864 A203865

Keyword

nonn

Author

R. H. Hardin Jan 07 2012

Status

approved