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A081867
a(n)=sigma_11(2n-1).
0
1, 177148, 48828126, 1977326744, 31381236757, 285311670612, 1792160394038, 8649804864648, 34271896307634, 116490258898220, 350279478046112, 952809757913928, 2384185839843751, 5559091947792280, 12200509765705830
OFFSET
1,2
MATHEMATICA
Table[DivisorSigma[11, 2n-1], {n, 20}] (* Harvey P. Dale, Jun 26 2012 *)
CROSSREFS
Cf. A013959.
Sequence in context: A017435 A017567 A321815 * A133972 A233480 A233475
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Apr 12 2003
STATUS
approved