A202555 Number of nX3 0,1 arrays with the row and column sums nondecreasing

4, 17, 66, 235, 824, 2848, 9520, 31648, 104536, 339553, 1099666, 3549038, 11338836, 36160324, 115069316, 363700188, 1148126044, 3619072821, 11352513438, 35579368776, 111388887136, 347450537496, 1083054672896, 3373317547471

Offset

1,1

Comments

Column 3 of A202560

Links

R. H. Hardin, Table of n, a(n) for n = 1..117

Example

Some solutions for n=8
..0..1..0....0..1..0....1..0..0....0..0..0....0..0..0....0..1..1....1..0..0
..0..0..1....0..1..0....0..0..1....0..0..1....0..0..1....1..0..1....1..1..0
..0..0..1....0..0..1....0..0..1....0..0..1....0..0..1....1..1..0....1..0..1
..0..1..0....0..0..1....0..0..1....1..0..0....0..1..0....1..0..1....1..1..0
..0..1..0....1..0..1....0..1..1....0..1..0....0..1..0....0..1..1....0..1..1
..0..0..1....1..0..1....1..1..0....0..1..1....1..0..0....0..1..1....0..1..1
..1..0..0....0..1..1....1..0..1....0..1..1....0..0..1....0..1..1....1..0..1
..0..1..1....1..1..0....0..1..1....1..1..1....0..1..1....1..0..1....0..1..1

Crossrefs

Sequence in context: A181410 A102207 A334827 * A045992 A217539 A046723

Adjacent sequences: A202552 A202553 A202554 * A202556 A202557 A202558

Keyword

nonn

Author

R. H. Hardin Dec 21 2011

Status

approved