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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.

A247254 a(1)=0; for n>1, a(n+1)= a(n)- A004648(n) if a(n)>= A004648(n) else a(n) + A004648(n).

Table of values

n a(n)
1 0
2 0
3 1
4 3
5 0
6 1
7 0
8 3
9 0
10 5
11 14
12 5
13 4
14 2
15 1
16 3
17 8
18 0
19 7
20 17
21 6
22 16
23 3
24 17
25 0
26 22
27 45
28 23
29 0
30 22
31 45
32 42
33 39
34 34
35 31
36 22
37 15
38 6
39 17
40 6
41 19
42 4
43 17
44 36
45 19
46 2
47 17
48 40
49 9
50 40
51 11
52 40
53 9
54 38
55 3
56 40
57 1
58 42
59 3
60 44
61 3
62 42
63 87
64 32
65 87
66 34
67 87
68 24
69 89
70 87
71 18
72 87
73 16
74 14

List of values

[0, 0, 1, 3, 0, 1, 0, 3, 0, 5, 14, 5, 4, 2, 1, 3, 8, 0, 7, 17, 6, 16, 3, 17, 0, 22, 45, 23, 0, 22, 45, 42, 39, 34, 31, 22, 15, 6, 17, 6, 19, 4, 17, 36, 19, 2, 17, 40, 9, 40, 11, 40, 9, 38, 3, 40, 1, 42, 3, 44, 3, 42, 87, 32, 87, 34, 87, 24, 89, 87, 18, 87, 16, 14]

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