cp's OEIS Frontend

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.

A267501 Relative of Hofstadter Q-sequence: a(n) = 0 if n <= 0, a(1) = a(2) = a(3) = 1; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 3.

Table of values

n a(n)
1 1
2 1
3 1
4 3
5 7
6 8
7 3
8 8
9 10
10 4
11 5
12 12
13 19
14 11
15 4
16 19
17 27
18 11
19 8
20 22
21 23
22 11
23 13
24 25
25 23
26 21
27 12
28 29
29 35
30 12
31 9
32 35
33 48
34 23
35 12
36 44
37 34
38 24
39 11
40 62
41 39
42 10
43 51
44 30
45 16
46 31
47 55
48 62
49 11
50 11
51 124
52 78
53 10
54 30
55 39
56 79
57 23
58 20
59 55
60 103
61 47
62 7
63 98

List of values

[1, 1, 1, 3, 7, 8, 3, 8, 10, 4, 5, 12, 19, 11, 4, 19, 27, 11, 8, 22, 23, 11, 13, 25, 23, 21, 12, 29, 35, 12, 9, 35, 48, 23, 12, 44, 34, 24, 11, 62, 39, 10, 51, 30, 16, 31, 55, 62, 11, 11, 124, 78, 10, 30, 39, 79, 23, 20, 55, 103, 47, 7, 98]

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

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