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A197210
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,2,1,0 for x=0,1,2,3,4.
0
1, 2, 14, 221, 10210, 1130812, 322715244, 242641943340, 469481820661588
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 2's, every 3 is next to 3 1's, every 4 is next to 4 0's.
Diagonal of A197217.
EXAMPLE
Some solutions for n=4
..1..3..1..0....1..3..1..0....1..3..1..1....0..0..0..0....2..2..0..0
..1..1..0..0....0..1..1..0....0..1..1..3....0..1..2..2....2..2..0..0
..3..1..1..0....0..1..3..1....0..0..0..1....1..3..2..2....0..1..0..0
..1..1..3..1....0..0..0..0....0..0..0..0....0..1..0..0....1..3..1..0
CROSSREFS
Cf. A197217.
Sequence in context: A068369 A034405 A372278 * A153668 A105749 A251692
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 11 2011
STATUS
approved