A201228 Number of n X n 0..3 arrays with every row and column running average nondecreasing rightwards and downwards, and the number of instances of each value within one of each other

4, 2, 114, 1028, 420662, 33222962, 112920979339

Offset

1,1

Comments

Diagonal of A201235

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=4
..0..0..1..1....0..0..0..1....0..0..0..0....0..0..0..1....0..0..0..0
..0..2..1..1....0..1..2..1....1..1..2..3....0..1..3..3....1..1..1..2
..0..3..3..2....2..2..3..3....1..2..3..3....1..2..3..2....1..2..3..2
..2..2..3..3....1..3..2..3....1..3..2..2....1..2..2..3....2..3..3..3

Crossrefs

Sequence in context: A201444 A236381 A335300 * A010319 A266069 A057167

Adjacent sequences: A201225 A201226 A201227 * A201229 A201230 A201231

Keyword

nonn

Author

R. H. Hardin Nov 28 2011

Status

approved