|
|
A196925
|
|
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 1,4,3,2,0 for x=0,1,2,3,4
|
|
0
|
|
|
1, 1, 2, 7, 65, 1242, 55546, 5603265, 1280956817, 661075536443, 771059112373171, 2031433178217758354
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,3
|
|
COMMENTS
|
Every 0 is next to 0 1's, every 1 is next to 1 4's, every 2 is next to 2 3's, every 3 is next to 3 2's, every 4 is next to 4 0's
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=4
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..4..0..0....0..4..0..0....0..0..4..0....0..0..0..0....0..0..0..0
..0..0..0..0....0..0..4..0....0..0..0..0....0..0..4..0....0..0..0..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|