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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.

A227902 Numbers n such that triangular(n) divides binomial(2n,n).

Table of values

n a(n)
1 1
2 2
3 4
4 6
5 15
6 20
7 24
8 28
9 40
10 42
11 45
12 66
13 72
14 77
15 88
16 91
17 104
18 110
19 126
20 140
21 153
22 156
23 170
24 187
25 190
26 204
27 209
28 210
29 220
30 228
31 231
32 238
33 240
34 266
35 276
36 299
37 304
38 308
39 312
40 315
41 322
42 325
43 330
44 345
45 368
46 378
47 414
48 420
49 429
50 435
51 440
52 442
53 450
54 459
55 460
56 464
57 468
58 476
59 480

List of values

[1, 2, 4, 6, 15, 20, 24, 28, 40, 42, 45, 66, 72, 77, 88, 91, 104, 110, 126, 140, 153, 156, 170, 187, 190, 204, 209, 210, 220, 228, 231, 238, 240, 266, 276, 299, 304, 308, 312, 315, 322, 325, 330, 345, 368, 378, 414, 420, 429, 435, 440, 442, 450, 459, 460, 464, 468, 476, 480]

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

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