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A002107 Expansion of Product_{k>=1} (1 - x^k)^2.

Table of values

n a(n)
0 1
1 -2
2 -1
3 2
4 1
5 2
6 -2
7 0
8 -2
9 -2
10 1
11 0
12 0
13 2
14 3
15 -2
16 2
17 0
18 0
19 -2
20 -2
21 0
22 0
23 -2
24 -1
25 0
26 2
27 2
28 -2
29 2
30 1
31 2
32 0
33 2
34 -2
35 -2
36 2
37 0
38 -2
39 0
40 -4
41 0
42 0
43 0
44 1
45 -2
46 0
47 0
48 2
49 0
50 2
51 2
52 1
53 -2
54 0
55 2
56 2
57 0
58 0
59 -2
60 0
61 -2
62 0
63 -2
64 2
65 0
66 -4
67 0
68 0
69 -2
70 -1
71 2
72 0
73 2
74 0
75 0
76 0
77 -2

List of values

[1, -2, -1, 2, 1, 2, -2, 0, -2, -2, 1, 0, 0, 2, 3, -2, 2, 0, 0, -2, -2, 0, 0, -2, -1, 0, 2, 2, -2, 2, 1, 2, 0, 2, -2, -2, 2, 0, -2, 0, -4, 0, 0, 0, 1, -2, 0, 0, 2, 0, 2, 2, 1, -2, 0, 2, 2, 0, 0, -2, 0, -2, 0, -2, 2, 0, -4, 0, 0, -2, -1, 2, 0, 2, 0, 0, 0, -2]

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