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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.

A051638 a(n) = Sum_{k=0..n} (C(n,k) mod 3).

Table of values

n a(n)
0 1
1 2
2 4
3 2
4 4
5 8
6 4
7 8
8 13
9 2
10 4
11 8
12 4
13 8
14 16
15 8
16 16
17 26
18 4
19 8
20 13
21 8
22 16
23 26
24 13
25 26
26 40
27 2
28 4
29 8
30 4
31 8
32 16
33 8
34 16
35 26
36 4
37 8
38 16
39 8
40 16
41 32
42 16
43 32
44 52
45 8
46 16
47 26
48 16
49 32
50 52
51 26
52 52
53 80
54 4
55 8
56 13
57 8
58 16
59 26
60 13
61 26
62 40
63 8
64 16
65 26
66 16
67 32
68 52
69 26
70 52
71 80
72 13

List of values

[1, 2, 4, 2, 4, 8, 4, 8, 13, 2, 4, 8, 4, 8, 16, 8, 16, 26, 4, 8, 13, 8, 16, 26, 13, 26, 40, 2, 4, 8, 4, 8, 16, 8, 16, 26, 4, 8, 16, 8, 16, 32, 16, 32, 52, 8, 16, 26, 16, 32, 52, 26, 52, 80, 4, 8, 13, 8, 16, 26, 13, 26, 40, 8, 16, 26, 16, 32, 52, 26, 52, 80, 13]

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