A202556 Number of nX4 0,1 arrays with the row and column sums nondecreasing

5, 37, 235, 1526, 9325, 57255, 342295, 2048759, 12097875, 71623580, 421070137, 2483305077, 14588495861, 85996521989, 505767515227, 2984447588198, 17583885515973, 103920730449567, 613473612747653, 3631554358770128

Offset

1,1

Comments

Column 4 of A202560

Links

R. H. Hardin, Table of n, a(n) for n = 1..46

Example

Some solutions for n=6
..1..0..1..0....0..0..0..0....0..0..1..0....0..0..0..0....0..1..0..0
..0..1..0..1....0..0..0..0....1..0..0..1....0..1..0..1....1..0..0..0
..0..1..0..1....0..0..0..0....0..1..0..1....1..0..0..1....0..0..0..1
..0..0..1..1....1..0..0..1....0..1..0..1....0..1..1..0....0..0..0..1
..1..1..0..0....0..0..1..1....1..0..1..1....0..0..1..1....0..0..1..0
..0..0..1..1....0..1..1..1....0..1..1..1....1..1..1..1....0..0..0..1

Crossrefs

Sequence in context: A339386 A088582 A088583 * A015548 A183385 A054417

Adjacent sequences: A202553 A202554 A202555 * A202557 A202558 A202559

Keyword

nonn

Author

R. H. Hardin Dec 21 2011

Status

approved