|
|
A232873
|
|
Number of (n+1)X(3+1) 0..1 arrays x(i,j) with row sums sum{j^2*x(i,j), j=1..3+1} nondecreasing, and column sums sum{i^2*x(i,j), i=1..n+1} nondecreasing
|
|
1
|
|
|
25, 130, 650, 2715, 8988, 26553, 74515, 202293, 523052, 1268666, 2897425, 6311293, 13270455, 26979740, 53109749, 101190045, 187316955, 338279583, 597743822, 1035188036, 1758172498, 2931994598, 4807675414, 7759356347, 12338518046
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=5
..0..0..0..0....1..0..0..0....0..0..0..0....1..0..0..0....1..0..0..1
..0..1..0..0....0..1..0..0....1..0..0..1....0..0..0..1....1..0..0..1
..1..0..1..0....0..1..0..0....1..0..1..1....1..1..0..1....0..0..1..1
..1..0..0..1....1..0..0..1....0..1..1..1....1..1..0..1....0..0..1..1
..0..1..1..1....1..0..1..1....0..1..1..1....0..0..1..1....1..0..1..1
..0..1..1..1....0..1..1..1....0..1..1..1....0..1..1..1....0..1..1..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|