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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A356129 a(n) = Sum_{k=1..n} k * sigma_{n-1}(k).

Table of values

n a(n)
1 1
2 7
3 41
4 395
5 4503
6 68969
7 1205345
8 24831145
9 574932340
10 14936279962
11 427782949566
12 13426887958078
13 457622797727840
14 16842616079514468
15 665489067204502336
16 28102162931539093732
17 1262904299189373463930
18 60182778247311758955112

List of values

[1, 7, 41, 395, 4503, 68969, 1205345, 24831145, 574932340, 14936279962, 427782949566, 13426887958078, 457622797727840, 16842616079514468, 665489067204502336, 28102162931539093732, 1262904299189373463930, 60182778247311758955112]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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