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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.

A135207 a(n)=Sum_digits{n^Sum_digits[a(n-1)]}, with a(0)=1.

Table of values

n a(n)
0 1
1 1
2 2
3 9
4 19
5 40
6 18
7 28
8 37
9 45
10 1
11 2
12 9
13 46
14 67
15 81
16 64
17 55
18 54
19 73
20 7
21 36
22 55
23 49
24 99
25 109
26 64
27 63
28 64
29 34
30 18
31 55
32 76
33 81
34 73
35 73
36 72
37 82
38 79
39 90
40 19
41 49
42 99
43 136
44 82
45 63
46 64
47 70
48 54
49 73
50 40
51 27
52 82
53 82
54 72
55 82
56 70
57 72
58 91
59 49
60 36
61 64
62 91
63 99
64 145
65 79
66 126
67 82
68 58
69 126
70 28

List of values

[1, 1, 2, 9, 19, 40, 18, 28, 37, 45, 1, 2, 9, 46, 67, 81, 64, 55, 54, 73, 7, 36, 55, 49, 99, 109, 64, 63, 64, 34, 18, 55, 76, 81, 73, 73, 72, 82, 79, 90, 19, 49, 99, 136, 82, 63, 64, 70, 54, 73, 40, 27, 82, 82, 72, 82, 70, 72, 91, 49, 36, 64, 91, 99, 145, 79, 126, 82, 58, 126, 28]

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