OFFSET
1,1
COMMENTS
Same as A049687, but written as triangle.
EXAMPLE
The triangle starts:
3
4 5
5 7 9
6 8 11 13
7 10 14 17 21
8 11 15 18 23 25
9 13 18 22 28 31 37
...
T(3,2) = 7, X indicating hidden grid points:
0-----1#####X#####X
| | | |
| | | |
2-----3-----4-----5
# | # | |
# | # | |
X-----6-----X-----7
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Hugo Pfoertner, Mar 12 2018
STATUS
approved