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.

A265897 Numbers n for which (2n+1)! / n! [= A000407(n)] is >= k! but < 2*k! for some k; positions of ones in A265891.

Table of values

n a(n)
0 0
1 1
2 3
3 8
4 11
5 14
6 17
7 20
8 23
9 30
10 37
11 41
12 52
13 56
14 60
15 64
16 68
17 72
18 76
19 89
20 93
21 97
22 106
23 110
24 119
25 128
26 132
27 137
28 146
29 155
30 164
31 169
32 178
33 183
34 197
35 202
36 216
37 221
38 226
39 231
40 260
41 265
42 270
43 275
44 280
45 285
46 290
47 295
48 300
49 331
50 336
51 341
52 346
53 351
54 367
55 372
56 377
57 393
58 398
59 403
60 414
61 419
62 435
63 440
64 451
65 456
66 467
67 472
68 483
69 494
70 499
71 510

List of values

[0, 1, 3, 8, 11, 14, 17, 20, 23, 30, 37, 41, 52, 56, 60, 64, 68, 72, 76, 89, 93, 97, 106, 110, 119, 128, 132, 137, 146, 155, 164, 169, 178, 183, 197, 202, 216, 221, 226, 231, 260, 265, 270, 275, 280, 285, 290, 295, 300, 331, 336, 341, 346, 351, 367, 372, 377, 393, 398, 403, 414, 419, 435, 440, 451, 456, 467, 472, 483, 494, 499, 510]