OFFSET
1,2
EXAMPLE
Triangle begins:
1;
2, 1;
2, 2, 1;
3, 2, 2, 1;
2, 3, 2, 2, 1;
4, 2, 3, 2, 2, 1;
2, 4, 2, 3, 2, 2, 1;
4, 2, 4, 2, 3, 2, 2, 1;
3, 4, 2, 4, 2, 3, 2, 2, 1;
4, 3, 4, 2, 4, 2, 3, 2, 2, 1;
2, 4, 3, 4, 2, 4, 2, 3, 2, 2, 1;
6, 2, 4, 3, 4, 2, 4, 2, 3, 2, 2, 1;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Omar E. Pol, Apr 21 2016
STATUS
approved