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.

A058008 Numbers k such that (2*k - 1)!/(k!)^2 is an integer.

Table of values

n a(n)
1 1
2 6
3 15
4 28
5 42
6 45
7 66
8 77
9 91
10 110
11 126
12 140
13 153
14 156
15 170
16 187
17 190
18 204
19 209
20 210
21 220
22 228
23 231
24 238
25 266
26 276
27 299
28 308
29 312
30 315
31 322
32 325
33 330
34 345
35 378
36 414
37 420
38 429
39 435
40 440
41 442
42 450
43 459
44 460
45 468
46 476
47 483
48 493
49 496
50 510
51 527
52 551
53 558
54 561
55 570

List of values

[1, 6, 15, 28, 42, 45, 66, 77, 91, 110, 126, 140, 153, 156, 170, 187, 190, 204, 209, 210, 220, 228, 231, 238, 266, 276, 299, 308, 312, 315, 322, 325, 330, 345, 378, 414, 420, 429, 435, 440, 442, 450, 459, 460, 468, 476, 483, 493, 496, 510, 527, 551, 558, 561, 570]