A201135 Number of n X n 0..5 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other

6, 30, 402, 7642, 129244, 1268728, 543067656, 126701693572, 19492581327460

Offset

1,1

Comments

Diagonal of A201142

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=4
..0..0..0..4....0..0..2..2....0..0..1..3....0..1..1..2....0..1..2..2
..1..1..3..4....0..1..2..3....0..1..2..3....0..2..3..3....0..2..3..4
..2..2..3..5....1..3..4..5....1..4..4..5....0..2..3..5....1..3..4..4
..2..4..5..5....3..4..4..5....2..4..5..5....4..4..5..5....3..5..5..5

Crossrefs

Sequence in context: A232978 A359882 A332041 * A369135 A111876 A119634

Adjacent sequences: A201132 A201133 A201134 * A201136 A201137 A201138

Keyword

nonn

Author

R. H. Hardin Nov 27 2011

Status

approved