OFFSET
0,3
EXAMPLE
Triangle begins:
0;
1, 4;
2, 6, 8;
3, 9, 10, 12;
4, 14, 15, 16, 18;
5, 20, 21, 22, 24, 25;
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Parthasarathy Nambi, Feb 16 2006
EXTENSIONS
More terms from Sean A. Irvine, Sep 22 2011
a(0)=0 inserted by Michel Marcus, Feb 03 2023
STATUS
approved