|
|
A140419
|
|
Number of n X n symmetric binary matrices with every element adjacent horizontally (and vertically) to some 0.
|
|
0
|
|
|
1, 5, 8, 21, 175, 1984, 27783, 566775, 18973984, 977497059, 72692403175, 7984795118976, 1348773682858701, 345874419612107295, 131649476800621708800, 74856171576736831201899
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
2,2
|
|
LINKS
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|