OFFSET
1,2
EXAMPLE
Some solutions for n=3:
0 0 1 0 1 0 1 1 0 0 1 0 0 0 1 1 0 0 1 1
0 1 0 1 1 0 1 1 0 0 1 1 0 0 0 1 0 1 0 1
0 1 1 1 1 0 1 1 0 1 1 1 0 0 0 1 0 0 0 1
0 0 1 1 1 0 1 1 0 0 1 0 0 1 1 1 0 1 1 1
CROSSREFS
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Mar 10 2013
STATUS
approved