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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.

A220498 Number of E-toothpicks (or tridents) added at n-th stage to the structure of the equilateral triangle of A220478.

Table of values

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

List of values

[0, 2, 2, 2, 4, 2, 4, 4, 4, 6, 4, 6, 8, 2, 4, 4, 6, 10, 6, 14, 8, 10, 14, 8, 12, 14, 4, 8, 8, 10, 16, 12, 22, 16, 16, 18, 12, 14, 16, 16, 16, 10, 12, 20, 14, 22, 22, 18, 18, 24, 18, 28, 18, 20, 28, 22, 28, 20, 18, 18, 22, 32, 32, 26, 24, 22, 28, 28, 32, 34, 20, 20, 28]

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

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