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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.

A358553 Number of internal (non-leaf) nodes in the n-th standard ordered rooted tree.

Table of values

n a(n)
1 0
2 1
3 2
4 1
5 3
6 2
7 2
8 1
9 2
10 3
11 3
12 2
13 3
14 2
15 2
16 1
17 4
18 2
19 4
20 3
21 4
22 3
23 3
24 2
25 2
26 3
27 3
28 2
29 3
30 2
31 2
32 1
33 3
34 4
35 3
36 2
37 5
38 4
39 4
40 3
41 3
42 4
43 4
44 3
45 4
46 3
47 3
48 2
49 4
50 2
51 4
52 3
53 4
54 3
55 3
56 2
57 2
58 3
59 3
60 2
61 3
62 2
63 2
64 1
65 3
66 3
67 5
68 4
69 4
70 3
71 3
72 2
73 4
74 5
75 5
76 4
77 5
78 4
79 4
80 3
81 5
82 3
83 5
84 4
85 5
86 4
87 4

List of values

[0, 1, 2, 1, 3, 2, 2, 1, 2, 3, 3, 2, 3, 2, 2, 1, 4, 2, 4, 3, 4, 3, 3, 2, 2, 3, 3, 2, 3, 2, 2, 1, 3, 4, 3, 2, 5, 4, 4, 3, 3, 4, 4, 3, 4, 3, 3, 2, 4, 2, 4, 3, 4, 3, 3, 2, 2, 3, 3, 2, 3, 2, 2, 1, 3, 3, 5, 4, 4, 3, 3, 2, 4, 5, 5, 4, 5, 4, 4, 3, 5, 3, 5, 4, 5, 4, 4]

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