OFFSET
2,3
EXAMPLE
Triangle begins:
1,
1,3,
2,4,6,
2,4,8,10,
3,6,9,13,15,
3,7,9,15,19,21,
4,8,12,16,22,26,28,
4,9,14,16,24,30,34,36,
5,10,16,20,25,33,39,43,45,
5,11,17,23,25,35,43,49,53,55,
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Sep 14 2014
STATUS
approved