login
A197228
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,1,2 for x=0,1,2,3,4
0
1, 7, 55, 2117, 249929, 98514881, 126615582841, 511052139999591
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 1's, every 4 is next to 4 2's
Diagonal of A197235
EXAMPLE
Some solutions for n=4
..0..0..0..0....2..0..0..2....2..0..1..0....0..1..2..0....0..0..0..1
..2..0..0..1....0..0..1..0....0..0..3..1....1..3..0..0....0..0..1..3
..2..0..1..3....2..1..3..1....0..0..1..0....0..1..0..0....0..0..2..1
..0..0..0..1....0..0..0..0....2..0..0..0....2..0..0..0....0..0..0..0
CROSSREFS
Sequence in context: A117993 A055056 A305282 * A009521 A116120 A056719
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 12 2011
STATUS
approved