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.

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

Offset

1,1

Comments

Column 3 of A232877

Links

R. H. Hardin, Table of n, a(n) for n = 1..29

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

Sequence in context: A042218 A045166 A365872 * A232856 A232792 A305956

Adjacent sequences: A232870 A232871 A232872 * A232874 A232875 A232876

Keyword

nonn

Author

R. H. Hardin, Dec 01 2013

Status

approved