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.

A333441 Numbers where each binary digit can be paired with a digit of the same value at another position so that two pairs can be nested but cannot otherwise overlap.

Table of values

n a(n)
1 0
2 3
3 9
4 12
5 15
6 33
7 36
8 39
9 45
10 48
11 51
12 54
13 57
14 60
15 63
16 129
17 132
18 135
19 141
20 144
21 147
22 150
23 153
24 156
25 159
26 165
27 177
28 180
29 183
30 189
31 192
32 195
33 198
34 201
35 204
36 207
37 210
38 216
39 219
40 222
41 225
42 228
43 231
44 237
45 240
46 243
47 246
48 249
49 252
50 255
51 513
52 516
53 519
54 525
55 528
56 531

List of values

[0, 3, 9, 12, 15, 33, 36, 39, 45, 48, 51, 54, 57, 60, 63, 129, 132, 135, 141, 144, 147, 150, 153, 156, 159, 165, 177, 180, 183, 189, 192, 195, 198, 201, 204, 207, 210, 216, 219, 222, 225, 228, 231, 237, 240, 243, 246, 249, 252, 255, 513, 516, 519, 525, 528, 531]

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

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