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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.

A298983 Triangle read by rows T(n,k) giving coefficients in expansion of Product_{j=1..n} (1-x^j)^2 mod x^(n+1)-1.

Table of values

n a(n)
0 1
1 2
2 -2
3 6
4 -3
5 -3
6 8
7 0
8 -8
9 0
10 20
11 -5
12 -5
13 -5
14 -5
15 12
16 6
17 -6
18 -12
19 -6
20 6
21 42
22 -7
23 -7
24 -7
25 -7
26 -7
27 -7
28 32
29 0
30 0
31 0
32 -32
33 0
34 0
35 0
36 54
37 0
38 0
39 -27
40 0
41 0
42 -27
43 0
44 0
45 40
46 10
47 -10
48 10
49 -10
50 -40
51 -10
52 10
53 -10
54 10
55 110
56 -11
57 -11
58 -11
59 -11
60 -11
61 -11
62 -11
63 -11
64 -11
65 -11

List of values

[1, 2, -2, 6, -3, -3, 8, 0, -8, 0, 20, -5, -5, -5, -5, 12, 6, -6, -12, -6, 6, 42, -7, -7, -7, -7, -7, -7, 32, 0, 0, 0, -32, 0, 0, 0, 54, 0, 0, -27, 0, 0, -27, 0, 0, 40, 10, -10, 10, -10, -40, -10, 10, -10, 10, 110, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11]