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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.

A234903 a(n)*Pi is the total length of irregular spiral (center points: 1, 3, 2) after n rotations.

Table of values

n a(n)
1 4
2 11
3 13
4 20
5 24
6 28
7 35
8 37
9 44
10 48
11 52
12 59
13 61
14 68
15 72
16 76
17 83
18 85
19 92
20 96
21 100
22 107
23 109
24 116
25 120
26 124
27 131
28 133
29 140
30 144
31 148
32 155
33 157
34 164
35 168
36 172
37 179
38 181
39 188
40 192
41 196
42 203
43 205
44 212
45 216
46 220
47 227
48 229
49 236
50 240
51 244
52 251
53 253
54 260
55 264
56 268
57 275
58 277
59 284
60 288
61 292
62 299
63 301
64 308
65 312
66 316
67 323
68 325

List of values

[4, 11, 13, 20, 24, 28, 35, 37, 44, 48, 52, 59, 61, 68, 72, 76, 83, 85, 92, 96, 100, 107, 109, 116, 120, 124, 131, 133, 140, 144, 148, 155, 157, 164, 168, 172, 179, 181, 188, 192, 196, 203, 205, 212, 216, 220, 227, 229, 236, 240, 244, 251, 253, 260, 264, 268, 275, 277, 284, 288, 292, 299, 301, 308, 312, 316, 323, 325]