OFFSET
0,3
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..500
FORMULA
MATHEMATICA
Join[{1}, Array[DivisorSigma[1, #!! ]&, 50, 1]]
PROG
(PARI) a(n)=sigma(prod(i=0, (n-1)\2, n - 2*i )) \\ Charles R Greathouse IV, May 01 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Joseph Stephan Orlovsky, Nov 01 2009
STATUS
approved