A232827 Number of (n+1)X(3+1) 0..1 arrays x(i,j) with row sums sum{j*x(i,j), j=1..3+1} nondecreasing, and column sums sum{i*x(i,j), i=1..n+1} nondecreasing

23, 128, 578, 2329, 8898, 32279, 111609, 367415, 1156446, 3507097, 10298283, 29408921, 81999117, 223720287, 598317070, 1572579642, 4069639443, 10383180004, 26154898488, 65117553622

Offset

1,1

Comments

Column 3 of A232831

Links

Table of n, a(n) for n=1..20.

Example

Some solutions for n=5
..0..0..1..0....0..0..1..0....0..1..0..0....0..0..0..1....0..0..0..0
..0..0..0..1....0..0..0..1....1..0..0..1....1..1..1..1....1..1..0..1
..0..0..0..1....0..0..1..1....0..1..1..0....1..1..1..1....0..0..1..1
..0..0..1..1....0..0..1..1....0..1..0..1....1..1..1..1....0..1..1..1
..0..0..1..1....1..1..1..1....0..0..1..1....1..1..1..1....1..1..1..1
..1..1..0..1....1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..1

Crossrefs

Sequence in context: A142518 A176822 A157146 * A217496 A141963 A157907

Adjacent sequences: A232824 A232825 A232826 * A232828 A232829 A232830

Keyword

nonn

Author

R. H. Hardin, Nov 30 2013

Status

approved