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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.

A030386 Triangle T(n,k): write n in base 4, reverse order of digits.

Table of values

n a(n)
0 0
1 1
2 2
3 3
4 0
5 1
6 1
7 1
8 2
9 1
10 3
11 1
12 0
13 2
14 1
15 2
16 2
17 2
18 3
19 2
20 0
21 3
22 1
23 3
24 2
25 3
26 3
27 3
28 0
29 0
30 1
31 1
32 0
33 1
34 2
35 0
36 1
37 3
38 0
39 1
40 0
41 1
42 1
43 1
44 1
45 1
46 2
47 1
48 1
49 3
50 1
51 1
52 0
53 2
54 1
55 1
56 2
57 1
58 2
59 2
60 1
61 3
62 2
63 1
64 0
65 3
66 1
67 1
68 3
69 1
70 2
71 3
72 1
73 3
74 3
75 1
76 0
77 0
78 2
79 1
80 0
81 2
82 2
83 0
84 2
85 3
86 0
87 2
88 0
89 1
90 2

List of values

[0, 1, 2, 3, 0, 1, 1, 1, 2, 1, 3, 1, 0, 2, 1, 2, 2, 2, 3, 2, 0, 3, 1, 3, 2, 3, 3, 3, 0, 0, 1, 1, 0, 1, 2, 0, 1, 3, 0, 1, 0, 1, 1, 1, 1, 1, 2, 1, 1, 3, 1, 1, 0, 2, 1, 1, 2, 1, 2, 2, 1, 3, 2, 1, 0, 3, 1, 1, 3, 1, 2, 3, 1, 3, 3, 1, 0, 0, 2, 1, 0, 2, 2, 0, 2, 3, 0, 2, 0, 1, 2]