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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.

A004001 Hofstadter-Conway $10000 sequence: a(n) = a(a(n-1)) + a(n-a(n-1)) with a(1) = a(2) = 1.

Table of values

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

List of values

[1, 1, 2, 2, 3, 4, 4, 4, 5, 6, 7, 7, 8, 8, 8, 8, 9, 10, 11, 12, 12, 13, 14, 14, 15, 15, 15, 16, 16, 16, 16, 16, 17, 18, 19, 20, 21, 21, 22, 23, 24, 24, 25, 26, 26, 27, 27, 27, 28, 29, 29, 30, 30, 30, 31, 31, 31, 31, 32, 32, 32, 32, 32, 32, 33, 34, 35, 36, 37, 38, 38, 39, 40, 41, 42]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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