OFFSET
0,11
EXAMPLE
Triangle (0<=k<=n) begins:
0,
0, 0,
1, 0, 0,
1, 1, 0, 0,
2, 1, 1, 0, 0,
2, 2, 1, 1, 0, 0,
4, 2, 2, 1, 1, 0, 0,
4, 4, 2, 2, 1, 1, 0, 0,
7, 4, 4, 2, 2, 1, 1, 0, 0,
8, 7, 4, 4, 2, 2, 1, 1, 0, 0,
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Omar E. Pol, Dec 01 2010
STATUS
approved