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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.

A050340 Number of ways of factoring n with 3 levels of parentheses.

Table of values

n a(n)
1 1
2 1
3 1
4 5
5 1
6 5
7 1
8 15
9 5
10 5
11 1
12 25
13 1
14 5
15 5
16 55
17 1
18 25
19 1
20 25
21 5
22 5
23 1
24 105
25 5
26 5
27 15
28 25
29 1
30 35
31 1
32 170
33 5
34 5
35 5
36 145
37 1
38 5
39 5
40 105
41 1
42 35
43 1
44 25
45 25
46 5
47 1
48 425
49 5
50 25
51 5
52 25
53 1
54 105
55 5
56 105
57 5
58 5
59 1
60 205
61 1
62 5
63 25
64 571
65 5
66 35
67 1
68 25
69 5
70 35
71 1
72 660
73 1
74 5
75 25
76 25
77 5
78 35
79 1
80 425
81 55
82 5

List of values

[1, 1, 1, 5, 1, 5, 1, 15, 5, 5, 1, 25, 1, 5, 5, 55, 1, 25, 1, 25, 5, 5, 1, 105, 5, 5, 15, 25, 1, 35, 1, 170, 5, 5, 5, 145, 1, 5, 5, 105, 1, 35, 1, 25, 25, 5, 1, 425, 5, 25, 5, 25, 1, 105, 5, 105, 5, 5, 1, 205, 1, 5, 25, 571, 5, 35, 1, 25, 5, 35, 1, 660, 1, 5, 25, 25, 5, 35, 1, 425, 55, 5]

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