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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.

A043263 Sum of the digits of the n-th base 4 palindrome.

Table of values

n a(n)
1 0
2 1
3 2
4 3
5 2
6 4
7 6
8 2
9 3
10 4
11 5
12 4
13 5
14 6
15 7
16 6
17 7
18 8
19 9
20 2
21 4
22 6
23 8
24 4
25 6
26 8
27 10
28 6
29 8
30 10
31 12
32 2
33 3
34 4
35 5
36 4
37 5
38 6
39 7
40 6
41 7
42 8
43 9
44 8
45 9
46 10
47 11
48 4
49 5
50 6
51 7
52 6
53 7
54 8
55 9
56 8
57 9
58 10
59 11
60 10
61 11
62 12
63 13
64 6
65 7
66 8
67 9
68 8
69 9
70 10
71 11
72 10
73 11
74 12
75 13
76 12
77 13
78 14
79 15
80 2
81 4

List of values

[0, 1, 2, 3, 2, 4, 6, 2, 3, 4, 5, 4, 5, 6, 7, 6, 7, 8, 9, 2, 4, 6, 8, 4, 6, 8, 10, 6, 8, 10, 12, 2, 3, 4, 5, 4, 5, 6, 7, 6, 7, 8, 9, 8, 9, 10, 11, 4, 5, 6, 7, 6, 7, 8, 9, 8, 9, 10, 11, 10, 11, 12, 13, 6, 7, 8, 9, 8, 9, 10, 11, 10, 11, 12, 13, 12, 13, 14, 15, 2, 4]

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