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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.

A356243 a(n) = Sum_{k=1..n} k^2 * sigma_{n-2}(k).

Table of values

n a(n)
1 1
2 9
3 49
4 447
5 4607
6 71009
7 1210855
8 24980627
9 575624572
10 14958422046
11 427890493960
12 13431874937840
13 457651929853662
14 16844143705998554
15 665499756005678382
16 28102799297908820326
17 1262909308355648335240
18 60183118566605371095996

List of values

[1, 9, 49, 447, 4607, 71009, 1210855, 24980627, 575624572, 14958422046, 427890493960, 13431874937840, 457651929853662, 16844143705998554, 665499756005678382, 28102799297908820326, 1262909308355648335240, 60183118566605371095996]

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

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