OFFSET
1,1
EXAMPLE
First boustrophedon path:
................................/1.
.............................../_____
...............................1.0.1.\
............................._________\
.........................../.1.0.0.1.0.
.........................../______________
...........................1.0.1.0.1.0.0.\
.........................__________________\
......................./.1.0.0.1.1.0.1.1.1
......................./_____________________
.......................1.0.1.0.0.0.0.0.1.1.0
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paolo P. Lava and Giorgio Balzarotti, Jul 02 2008
STATUS
approved