A196071 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 0,3,2,1,4 for x=0,1,2,3,4

1, 1, 1, 8, 77, 1126, 31062, 1430161, 124227477

Offset

1,4

Comments

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

Diagonal of A196078

Links

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

Example

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

Crossrefs

Sequence in context: A024103 A187638 A092661 * A304303 A074841 A272208

Adjacent sequences: A196068 A196069 A196070 * A196072 A196073 A196074

Keyword

nonn

Author

R. H. Hardin Sep 27 2011

Status

approved