A201209 Number of n X n 0..3 arrays with every row and column running average nondecreasing rightwards and downwards

4, 50, 1684, 146946, 33635880, 21062625664, 37432954261477

Offset

1,1

Comments

Diagonal of A201216

Links

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

Example

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

Crossrefs

Sequence in context: A173218 A234714 A201829 * A026865 A016078 A327229

Adjacent sequences: A201206 A201207 A201208 * A201210 A201211 A201212

Keyword

nonn

Author

R. H. Hardin Nov 28 2011

Status

approved