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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.

A271654 a(n) = Sum_{k|n} binomial(n-1,k-1).

Table of values

n a(n)
1 1
2 2
3 2
4 5
5 2
6 17
7 2
8 44
9 30
10 137
11 2
12 695
13 2
14 1731
15 1094
16 6907
17 2
18 30653
19 2
20 97244
21 38952
22 352739
23 2
24 1632933
25 10628
26 5200327
27 1562602
28 20357264
29 2
30 87716708
31 2
32 303174298
33 64512738
34 1166803145
35 1391282
36 4978661179
37 2
38 17672631939
39 2707475853
40 69150651910
41 2
42 286754260229
43 2
44 1053966829029
45 115133177854
46 4116715363847
47 2
48 16892899722499
49 12271514
50 63207357886437

List of values

[1, 2, 2, 5, 2, 17, 2, 44, 30, 137, 2, 695, 2, 1731, 1094, 6907, 2, 30653, 2, 97244, 38952, 352739, 2, 1632933, 10628, 5200327, 1562602, 20357264, 2, 87716708, 2, 303174298, 64512738, 1166803145, 1391282, 4978661179, 2, 17672631939, 2707475853, 69150651910, 2, 286754260229, 2, 1053966829029, 115133177854, 4116715363847, 2, 16892899722499, 12271514, 63207357886437]

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