A196968 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,2,1 for x=0,1,2,3,4

1, 7, 34, 815, 31899, 3602632, 986337603, 654433849619, 1060308532244235

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 2's, every 4 is next to 4 1's

Diagonal of A196974

Links

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

Example

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

Crossrefs

Sequence in context: A232043 A360506 A027683 * A000829 A247158 A285802

Adjacent sequences: A196965 A196966 A196967 * A196969 A196970 A196971

Keyword

nonn

Author

R. H. Hardin Oct 08 2011

Status

approved