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.

A220521 Number of toothpicks or D-toothpicks added at n-th stage in the toothpick structure of A220520.

Table of values

n a(n)
1 1
2 2
3 4
4 4
5 4
6 4
7 8
8 8
9 4
10 4
11 8
12 12
13 16
14 12
15 16
16 16
17 4
18 4
19 8
20 12
21 16
22 20
23 24
24 26
25 24
26 12
27 20
28 32
29 40
30 28
31 32
32 32
33 4
34 4
35 8
36 12
37 16
38 20
39 24
40 26
41 24
42 20
43 32
44 44
45 64
46 52
47 48
48 54
49 40
50 12
51 20
52 36
53 48
54 56
55 64
56 74
57 76
58 30
59 44
60 72
61 88
62 60
63 64
64 64
65 4
66 4
67 8
68 12

List of values

[1, 2, 4, 4, 4, 4, 8, 8, 4, 4, 8, 12, 16, 12, 16, 16, 4, 4, 8, 12, 16, 20, 24, 26, 24, 12, 20, 32, 40, 28, 32, 32, 4, 4, 8, 12, 16, 20, 24, 26, 24, 20, 32, 44, 64, 52, 48, 54, 40, 12, 20, 36, 48, 56, 64, 74, 76, 30, 44, 72, 88, 60, 64, 64, 4, 4, 8, 12]

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

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