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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.

A265307 Decimal expansion of Sum_{k>=1} (c(2k)-e), where c = convergents to e.

Table of values

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

List of values

[3, 1, 3, 9, 3, 4, 3, 0, 5, 9, 8, 4, 4, 1, 2, 4, 0, 5, 2, 5, 6, 5, 9, 6, 0, 0, 7, 5, 9, 6, 8, 3, 4, 7, 7, 7, 8, 0, 0, 5, 7, 7, 7, 4, 9, 1, 4, 9, 6, 7, 1, 5, 1, 9, 5, 1, 3, 3, 1, 0, 1, 9, 7, 5, 8, 6, 6, 3, 8, 0, 2, 9, 1, 0, 5, 2, 2, 5, 2, 8, 5, 1, 6, 4, 1, 5]