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A081865
a(n) = sigma_7(2n-1).
1
1, 2188, 78126, 823544, 4785157, 19487172, 62748518, 170939688, 410338674, 893871740, 1801914272, 3404825448, 6103593751, 10465138360, 17249876310, 27512614112, 42637932336, 64340198544, 94931877134, 137293757384, 194754273882, 271818611108, 373845175782
OFFSET
1,2
LINKS
MATHEMATICA
DivisorSigma[7, Range[1, 45, 2]] (* Amiram Eldar, Aug 17 2019 *)
PROG
(PARI) a(n) = sigma(2*n-1, 7); \\ Michel Marcus, Dec 04 2013
CROSSREFS
Cf. A013955.
Sequence in context: A357674 A352035 A321811 * A085442 A208549 A251316
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Apr 12 2003
EXTENSIONS
Three more terms from Michel Marcus, Dec 04 2013
STATUS
approved