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.

A039004 Numbers whose base-4 representation has the same number of 1's and 2's.

Table of values

n a(n)
1 0
2 3
3 6
4 9
5 12
6 15
7 18
8 24
9 27
10 30
11 33
12 36
13 39
14 45
15 48
16 51
17 54
18 57
19 60
20 63
21 66
22 72
23 75
24 78
25 90
26 96
27 99
28 102
29 105
30 108
31 111
32 114
33 120
34 123
35 126
36 129
37 132
38 135
39 141
40 144
41 147
42 150
43 153
44 156
45 159
46 165
47 177
48 180
49 183
50 189
51 192
52 195
53 198
54 201
55 204
56 207
57 210
58 216
59 219

List of values

[0, 3, 6, 9, 12, 15, 18, 24, 27, 30, 33, 36, 39, 45, 48, 51, 54, 57, 60, 63, 66, 72, 75, 78, 90, 96, 99, 102, 105, 108, 111, 114, 120, 123, 126, 129, 132, 135, 141, 144, 147, 150, 153, 156, 159, 165, 177, 180, 183, 189, 192, 195, 198, 201, 204, 207, 210, 216, 219]