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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.

A133257 The number of edges on a piece of paper that has been folded n times (see comments for more precise definition).

Table of values

n a(n)
0 4
1 7
2 11
3 17
4 25
5 37
6 53
7 77
8 109
9 157
10 221
11 317
12 445
13 637
14 893
15 1277
16 1789
17 2557
18 3581
19 5117
20 7165
21 10237
22 14333
23 20477
24 28669
25 40957
26 57341
27 81917
28 114685
29 163837
30 229373
31 327677
32 458749
33 655357
34 917501
35 1310717
36 1835005
37 2621437
38 3670013
39 5242877
40 7340029

List of values

[4, 7, 11, 17, 25, 37, 53, 77, 109, 157, 221, 317, 445, 637, 893, 1277, 1789, 2557, 3581, 5117, 7165, 10237, 14333, 20477, 28669, 40957, 57341, 81917, 114685, 163837, 229373, 327677, 458749, 655357, 917501, 1310717, 1835005, 2621437, 3670013, 5242877, 7340029]

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

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