|
|
A190656
|
|
Half the number of n X n symmetric binary matrices with no element unequal to a strict majority of its king-move neighbors
|
|
0
|
|
|
1, 1, 1, 2, 5, 20, 86, 486, 3495, 31938, 368832, 5412981, 100924470, 2390092072, 71686035608, 2726514241955, 131508854502755, 8039052200861454, 622678408143680652
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,4
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=5 with a(1,1)=0
..0..0..1..1..1....0..0..0..1..1....0..0..0..1..1....0..0..0..0..0
..0..0..1..1..1....0..0..0..1..1....0..0..0..1..1....0..0..0..0..0
..1..1..0..0..0....0..0..1..1..1....0..0..0..1..1....0..0..0..0..0
..1..1..0..0..0....1..1..1..1..1....1..1..1..0..0....0..0..0..0..0
..1..1..0..0..0....1..1..1..1..1....1..1..1..0..0....0..0..0..0..0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|