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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.

A128502 Convolution array for Chebyshev's S(n,x)=U(n,x/2) polynomials.

Table of values

n a(n)
0 1
1 2
2 3
3 -2
4 4
5 -6
6 5
7 -12
8 3
9 6
10 -20
11 12
12 7
13 -30
14 30
15 -4
16 8
17 -42
18 60
19 -20
20 9
21 -56
22 105
23 -60
24 5
25 10
26 -72
27 168
28 -140
29 30
30 11
31 -90
32 252
33 -280
34 105
35 -6
36 12
37 -110
38 360
39 -504
40 280
41 -42
42 13
43 -132
44 495
45 -840
46 630
47 -168
48 7
49 14
50 -156
51 660
52 -1320
53 1260
54 -504
55 56
56 15
57 -182
58 858
59 -1980
60 2310
61 -1260
62 252
63 -8
64 16
65 -210
66 1092

List of values

[1, 2, 3, -2, 4, -6, 5, -12, 3, 6, -20, 12, 7, -30, 30, -4, 8, -42, 60, -20, 9, -56, 105, -60, 5, 10, -72, 168, -140, 30, 11, -90, 252, -280, 105, -6, 12, -110, 360, -504, 280, -42, 13, -132, 495, -840, 630, -168, 7, 14, -156, 660, -1320, 1260, -504, 56, 15, -182, 858, -1980, 2310, -1260, 252, -8, 16, -210, 1092]