cp's OEIS Frontend

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.

A321560 a(n) = Sum_{d divides n} (-1)^(d + n/d) * d^4.

Table of values

n a(n)
1 1
2 -17
3 82
4 -241
5 626
6 -1394
7 2402
8 -3825
9 6643
10 -10642
11 14642
12 -19762
13 28562
14 -40834
15 51332
16 -61169
17 83522
18 -112931
19 130322
20 -150866
21 196964
22 -248914
23 279842
24 -313650
25 391251
26 -485554
27 538084
28 -578882
29 707282
30 -872644
31 923522
32 -978673
33 1200644

List of values

[1, -17, 82, -241, 626, -1394, 2402, -3825, 6643, -10642, 14642, -19762, 28562, -40834, 51332, -61169, 83522, -112931, 130322, -150866, 196964, -248914, 279842, -313650, 391251, -485554, 538084, -578882, 707282, -872644, 923522, -978673, 1200644]