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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.

A266409 a(n) = (A003309(n+2)-1) / 2; numbers n such that 2n+1 is a Ludic number (in A003309).

Table of values

n a(n)
1 1
2 2
3 3
4 5
5 6
6 8
7 11
8 12
9 14
10 18
11 20
12 21
13 23
14 26
15 30
16 33
17 35
18 38
19 41
20 44
21 45
22 48
23 53
24 57
25 59
26 60
27 63
28 65
29 71
30 74
31 78
32 80
33 86
34 87
35 89
36 90
37 96
38 104
39 105
40 110
41 111
42 113
43 116
44 117
45 119
46 123
47 128
48 132
49 138
50 141
51 143
52 150
53 153
54 156
55 164
56 165
57 168
58 170
59 176
60 179
61 180
62 188
63 191
64 194
65 198
66 203
67 207
68 209
69 210
70 215

List of values

[1, 2, 3, 5, 6, 8, 11, 12, 14, 18, 20, 21, 23, 26, 30, 33, 35, 38, 41, 44, 45, 48, 53, 57, 59, 60, 63, 65, 71, 74, 78, 80, 86, 87, 89, 90, 96, 104, 105, 110, 111, 113, 116, 117, 119, 123, 128, 132, 138, 141, 143, 150, 153, 156, 164, 165, 168, 170, 176, 179, 180, 188, 191, 194, 198, 203, 207, 209, 210, 215]

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

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