A196422 Number of n X n 0..4 arrays with each element equal to the number of its horizontal and vertical neighbors less than itself.

1, 23, 1377, 1436945, 9212529925, 474961518391793, 200900509921996396385

Offset

1,2

Comments

Diagonal of A196430.

Links

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

Example

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

Crossrefs

Cf. A196430.

Sequence in context: A201309 A049003 A268961 * A351508 A248703 A264903

Adjacent sequences: A196419 A196420 A196421 * A196423 A196424 A196425

Keyword

nonn

Author

R. H. Hardin Oct 02 2011

Status

approved