A202575 Number of n X n 0..3 arrays with the row and column sums nondecreasing

4, 90, 15688, 27871870, 550113111784

Offset

1,1

Comments

Diagonal of A202581

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for n=3
..0..1..0....1..0..1....0..1..2....0..1..2....0..1..1....0..2..1....1..1..0
..1..0..3....0..1..3....0..3..0....0..2..2....2..0..2....1..1..2....2..0..1
..2..3..1....3..3..0....1..0..2....2..0..3....1..2..3....0..3..3....0..2..3

Crossrefs

Sequence in context: A339987 A202918 A146506 * A201721 A195559 A195551

Adjacent sequences: A202572 A202573 A202574 * A202576 A202577 A202578

Keyword

nonn

Author

R. H. Hardin Dec 21 2011

Status

approved