A081862 (1/168)*(sigma_7(2n-1)-sigma_1(2n-1)).

0, 13, 465, 4902, 28483, 115995, 373503, 1017498, 2442492, 5320665, 10725680, 20266818, 36330915, 62292490, 102677835, 163765560, 253797216, 382977372, 565070697, 817224746, 1159251630, 1617967923, 2225268903, 3015613812

Offset

1,2

Links

Table of n, a(n) for n=1..24.

Mathematica

Table[(DivisorSigma[7, n]-DivisorSigma[1, n])/168, {n, 1, 49, 2}] (* Harvey P. Dale, Sep 17 2013 *)

Crossrefs

Cf. A000203, A081863(3).

Sequence in context: A338177 A166184 A272656 * A198012 A197895 A197749

Adjacent sequences: A081859 A081860 A081861 * A081863 A081864 A081865

Keyword

nonn

Author

Benoit Cloitre, Apr 11 2003

Status

approved