A203093 Number of n X n 0..3 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor

1, 84, 48552, 308642476, 27467664499412, 32766523337754473494, 516228209623915573866603862, 107889416526594162925859037893676244

Offset

1,2

Comments

Diagonal of A203101

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A185403 A269897 A184896 * A290274 A289557 A202580

Adjacent sequences: A203090 A203091 A203092 * A203094 A203095 A203096

Keyword

nonn

Author

R. H. Hardin Dec 29 2011

Status

approved