A198149 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,1,1 for x=0,1,2,3,4.

1, 7, 54, 2093, 260917, 108428600, 147146211014, 642756367398421

Offset

1,2

Comments

Every 0 is next to 0 4's, every 1 is next to 1 3's, every 2 is next to 2 0's, every 3 is next to 3 1's, every 4 is next to 4 1's

Diagonal of A198155

Links

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

Example

Some solutions containing all values 0 to 4 for n=4
..2..0..0..1....1..0..0..2....1..3..1..0....0..1..3..1....1..3..1..0
..0..2..1..3....3..1..0..0....0..1..4..1....1..4..1..0....0..1..4..1
..0..1..4..1....1..4..1..0....0..0..1..3....3..1..0..0....0..2..1..3
..1..3..1..0....0..1..3..1....2..0..0..1....1..0..0..2....2..0..0..1

Crossrefs

Sequence in context: A289865 A182124 A303889 * A203878 A043077 A192718

Adjacent sequences: A198146 A198147 A198148 * A198150 A198151 A198152

Keyword

nonn

Author

R. H. Hardin, Oct 21 2011

Status

approved