|
|
A233368
|
|
Number of (3+1)X(n+1) 0..1 arrays x(i,j) with row sums sum{j*x(i,j), j=1..n+1} nondecreasing, and column sums sum{i^2*x(i,j), i=1..3+1} nondecreasing
|
|
1
|
|
|
25, 139, 568, 1964, 6412, 19711, 56427, 150258, 375826, 893100, 2024828, 4391269, 9165068, 18490081, 36156100, 68675984, 126997620, 229017852, 403366974, 695484750, 1176286197, 1955039200, 3196887389, 5147543575, 8168623537
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=5
..1..1..1..0..0..0....1..1..1..0..0..0....0..0..0..1..0..0....0..0..0..0..0..0
..1..1..0..1..1..1....0..0..0..0..0..1....1..0..0..0..1..1....0..1..1..0..0..0
..1..1..0..1..1..1....0..0..0..1..1..1....1..0..1..1..1..1....0..1..0..1..1..1
..0..0..1..1..1..1....1..1..1..1..1..1....0..1..1..1..1..1....0..0..1..1..1..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|