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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.

A265403 Numbers n for which gcd{k=1..n-1} binomial(2*n, 2*k) = 2n-1.

Table of values

n a(n)
1 10
2 12
3 21
4 22
5 24
6 30
7 34
8 36
9 40
10 51
11 52
12 55
13 57
14 69
15 70
16 76
17 82
18 84
19 87
20 90
21 96
22 99
23 100
24 106
25 112
26 114
27 115
28 117
29 120
30 129
31 132
32 136
33 141
34 142
35 147
36 154
37 156
38 159
39 166
40 174
41 177
42 180
43 184
44 187
45 192
46 195
47 201
48 205
49 210
50 216
51 217
52 220
53 222
54 225
55 231
56 232
57 234
58 240
59 244
60 246
61 250
62 252
63 255
64 261
65 262
66 274
67 279
68 282
69 285
70 286
71 294
72 297
73 300

List of values

[10, 12, 21, 22, 24, 30, 34, 36, 40, 51, 52, 55, 57, 69, 70, 76, 82, 84, 87, 90, 96, 99, 100, 106, 112, 114, 115, 117, 120, 129, 132, 136, 141, 142, 147, 154, 156, 159, 166, 174, 177, 180, 184, 187, 192, 195, 201, 205, 210, 216, 217, 220, 222, 225, 231, 232, 234, 240, 244, 246, 250, 252, 255, 261, 262, 274, 279, 282, 285, 286, 294, 297, 300]