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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.

A131810 Additive persistence of Catalan numbers.

Table of values

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

List of values

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

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