|
|
A143883
|
|
Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard symmetric about main diagonal.
|
|
1
|
|
|
1, 2, 7, 29, 160, 1135, 10529, 125770, 1963039, 39868375, 1061669314, 37110747097, 1708827058427
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,more,hard
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|