OFFSET
1,3
COMMENTS
The pairs (i,j) are ordered in segments thus: segment 1: 1 segment 2: 1 2 2 segment 3: 1 3 3 2 3 segment 4: 1 4 4 2 4 3 4 segment 5: 1 5 5 2 5 3 5 4 5 and so on.
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Aug 05 2004
STATUS
approved