OFFSET
1,1
FORMULA
EXAMPLE
a(1)=3=1+2. a(2)=6=1+2+3. a(3)=15=1+2+3+4+5. a(4)=28=1+2+3+4+5+6+7. a(5)=1=1. a(6)=3=1+2.
MAPLE
CROSSREFS
KEYWORD
nonn,base,less
AUTHOR
Juri-Stepan Gerasimov, Jun 15 2009
EXTENSIONS
Definition reworded and a 16 split in 1,6 by R. J. Mathar, Jun 16 2009
STATUS
approved