OFFSET
1,2
EXAMPLE
1;
2,2;
3,3,3;
4,4,3,4,4;
5,5,4,5,4,5,5;
6,6,5,4,6,5,4,6,5,6,6;
7,7,6,5,7,6,5,5,7,6,5,7,6,7,7;
CROSSREFS
KEYWORD
easy,nonn,tabf
AUTHOR
Alford Arnold, Aug 02 2010
STATUS
approved