A196338 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 1,4,0,2,3 for x=0,1,2,3,4

1, 7, 30, 495, 16949, 1300388, 224664284, 86035336419, 73179371169968, 138149268301786989

Offset

1,2

Comments

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

Diagonal of A196343

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A026653 A271554 A296013 * A196315 A156347 A221402

Adjacent sequences: A196335 A196336 A196337 * A196339 A196340 A196341

Keyword

nonn

Author

R. H. Hardin Oct 01 2011

Status

approved