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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.

A282031 Coefficients in q-expansion of (9*E_2(q^3)-E_2(q))/8.

Table of values

n a(n)
0 1
1 3
2 9
3 -15
4 21
5 18
6 -45
7 24
8 45
9 -69
10 54
11 36
12 -105
13 42
14 72
15 -90
16 93
17 54
18 -207
19 60
20 126
21 -120
22 108
23 72
24 -225
25 93
26 126
27 -231
28 168
29 90
30 -270
31 96
32 189
33 -180
34 162
35 144
36 -483
37 114
38 180
39 -210
40 270
41 126
42 -360
43 132
44 252
45 -414
46 216
47 144
48 -465
49 171
50 279
51 -270
52 294
53 162
54 -693
55 216
56 360
57 -300
58 270
59 180

List of values

[1, 3, 9, -15, 21, 18, -45, 24, 45, -69, 54, 36, -105, 42, 72, -90, 93, 54, -207, 60, 126, -120, 108, 72, -225, 93, 126, -231, 168, 90, -270, 96, 189, -180, 162, 144, -483, 114, 180, -210, 270, 126, -360, 132, 252, -414, 216, 144, -465, 171, 279, -270, 294, 162, -693, 216, 360, -300, 270, 180]