|
|
A229165
|
|
a(n) is the number of n X n matrices of 0's, 1's and -1's in which the entries in each row or column sum to 1 and there are no adjacent -1's or 1's in any row or column.
|
|
1
|
|
|
|
OFFSET
|
1,2
|
|
LINKS
|
|
|
CROSSREFS
|
Cf. A050204 (entries in each row or column sum to 1).
|
|
KEYWORD
|
nonn,more
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|