OFFSET
1,1
EXAMPLE
Irregular array begins:
3, 3
5, 5
15, 15
7, 21, 35, 35, 21, 7
9, 9
45, 45
...
CROSSREFS
KEYWORD
nonn,easy,tabf
AUTHOR
EXTENSIONS
More terms from Erich Friedman
Offset corrected by Mohammad K. Azarian, Nov 19 2008
STATUS
approved