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A081866
a(n)=sigma_9(2n-1).
1
1, 19684, 1953126, 40353608, 387440173, 2357947692, 10604499374, 38445332184, 118587876498, 322687697780, 794320419872, 1801152661464, 3814699218751, 7625984925160, 14507145975870, 26439622160672, 46413842369328
OFFSET
1,2
LINKS
MATHEMATICA
DivisorSigma[9, Range[1, 41, 2]] (* Harvey P. Dale, Dec 01 2013 *)
CROSSREFS
Cf. A013957.
Sequence in context: A017565 A352037 A321813 * A288885 A253493 A253500
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Apr 12 2003
STATUS
approved