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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.

A308366 Expansion of Sum_{k>=1} (-1)^(k+1)*k*x^k/(1 - k*x^k).

Table of values

n a(n)
1 1
2 -1
3 4
4 -7
5 6
6 -4
7 8
8 -39
9 37
10 -16
11 12
12 -94
13 14
14 -92
15 384
16 -591
17 18
18 65
19 20
20 -1542
21 2552
22 -1948
23 24
24 -3606
25 3151
26 -8048
27 20440
28 -30590
29 30
30 33326
31 32
32 -135455
33 178512
34 -130816
35 94968
36 -35029
37 38
38 -523964
39 1596560
40 -1749734
41 42
42 2521186
43 44
44 -8374494
45 16364502

List of values

[1, -1, 4, -7, 6, -4, 8, -39, 37, -16, 12, -94, 14, -92, 384, -591, 18, 65, 20, -1542, 2552, -1948, 24, -3606, 3151, -8048, 20440, -30590, 30, 33326, 32, -135455, 178512, -130816, 94968, -35029, 38, -523964, 1596560, -1749734, 42, 2521186, 44, -8374494, 16364502]