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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.

A234904 a(n)*Pi is the total length of irregular spiral (center points: 2, 1, 3) after n rotations.

Table of values

n a(n)
1 3
2 12
3 18
4 21
5 30
6 36
7 39
8 48
9 54
10 57
11 66
12 72
13 75
14 84
15 90
16 93
17 102
18 108
19 111
20 120
21 126
22 129
23 138
24 144
25 147
26 156
27 162
28 165
29 174
30 180
31 183
32 192
33 198
34 201
35 210
36 216
37 219
38 228
39 234
40 237
41 246
42 252
43 255
44 264
45 270
46 273
47 282
48 288
49 291
50 300
51 306
52 309
53 318
54 324
55 327
56 336
57 342
58 345
59 354
60 360
61 363
62 372
63 378
64 381
65 390
66 396
67 399
68 408

List of values

[3, 12, 18, 21, 30, 36, 39, 48, 54, 57, 66, 72, 75, 84, 90, 93, 102, 108, 111, 120, 126, 129, 138, 144, 147, 156, 162, 165, 174, 180, 183, 192, 198, 201, 210, 216, 219, 228, 234, 237, 246, 252, 255, 264, 270, 273, 282, 288, 291, 300, 306, 309, 318, 324, 327, 336, 342, 345, 354, 360, 363, 372, 378, 381, 390, 396, 399, 408]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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