A196725 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,1,4,0,3 for x=0,1,2,3,4

1, 5, 76, 3394, 547874, 280203939, 466328648058, 2525576718158704, 44298467976731953802, 2511317101071327391390891

Offset

1,2

Comments

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

Diagonal of A196729

Links

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

Example

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

Crossrefs

Sequence in context: A209095 A136300 A196689 * A197063 A144997 A088756

Adjacent sequences: A196722 A196723 A196724 * A196726 A196727 A196728

Keyword

nonn

Author

R. H. Hardin Oct 05 2011

Status

approved