A232874 Number of (n+1)X(4+1) 0..1 arrays x(i,j) with row sums sum{j^2*x(i,j), j=1..4+1} nondecreasing, and column sums sum{i^2*x(i,j), i=1..n+1} nondecreasing

39, 311, 2715, 21639, 133532, 706994, 3457755, 16257008, 72992744, 309583532, 1229822682, 4620454491, 16559895238, 56785677343, 186875868230

Offset

1,1

Comments

Column 4 of A232877

Links

Table of n, a(n) for n=1..15.

Example

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

Crossrefs

Sequence in context: A327344 A190537 A187095 * A061169 A233369 A238102

Adjacent sequences: A232871 A232872 A232873 * A232875 A232876 A232877

Keyword

nonn

Author

R. H. Hardin, Dec 01 2013

Status

approved