OFFSET
1,2
FORMULA
Binomial transform of sigma(n), A000203.
EXAMPLE
a(4) = 29 = (1, 3, 3, 1) dot (1, 3, 4, 7) = (1 + 9 + 12 + 7).
CROSSREFS
KEYWORD
nonn
AUTHOR
Gary W. Adamson, Jun 11 2007
EXTENSIONS
More terms from Carl Najafi, Sep 08 2011
STATUS
approved