OFFSET
1,1
EXAMPLE
0+1*2=2=a(1).
3+2*2=7=a(2).
5+2*3=11=a(3).
7+2*3 =13=a(4).
3+2*2=7=a(5).
5+11*2=27=a(6).
2+3*13 =41=a(7).
2+7*3=23=a(8), etc.
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Oct 31 2008
EXTENSIONS
a(67) corrected by R. J. Mathar, Apr 14 2010
STATUS
approved