OFFSET
0,3
MATHEMATICA
Array[DivisorSigma[1, #!!! ]&, 7, 1]
PROG
(PARI) A167368(n)=sigma( prod(k=0, n\2-1, n-2*k) ! ) \\ M. F. Hasler, Feb 07 2011
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Vladimir Joseph Stephan Orlovsky, Nov 01 2009
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Jan 12 2022
STATUS
approved