OFFSET
1,2
COMMENTS
Left border = A002620 starting (1, 2, 4, 6, 9, 12, 16, ...).
EXAMPLE
First few rows of the triangle:
1;
2, 2;
4, 0, 3;
6, 5, 0, 4;
9, 0, 3, 0, 5;
12, 9, 4, 4, 0, 6;
16, 0, 3, 0, 5, 0, 7;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Apr 05 2007
STATUS
approved