A196536 Number of n X n 0..4 arrays with each element equal to the number of its horizontal and vertical neighbors less than or equal to itself

1, 23, 555, 340286, 1202209625, 40385639042743, 11727457709816827017

Offset

1,2

Comments

Diagonal of A196544

Links

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

Example

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

Crossrefs

Sequence in context: A062511 A159664 A158631 * A231261 A242358 A043347

Adjacent sequences: A196533 A196534 A196535 * A196537 A196538 A196539

Keyword

nonn

Author

R. H. Hardin Oct 03 2011

Status

approved