OFFSET
1,1
EXAMPLE
a(1)=2^3-0^3=8. a(2)=3^3-1^2=26. a(3)=5^3-4^3=61. a(4)=7^3-6^3=127.
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Jul 21 2009
EXTENSIONS
Extended by R. J. Mathar, Jul 31 2009
STATUS
approved