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.

A265898 Numbers n for which (2n)! / n! [= A001813(n)] is >= k! but < 2*k! for some k; positions of ones in A265894.

Table of values

n a(n)
0 0
1 1
2 3
3 6
4 8
5 11
6 14
7 17
8 20
9 27
10 34
11 41
12 45
13 49
14 81
15 85
16 89
17 102
18 106
19 115
20 124
21 128
22 137
23 142
24 146
25 151
26 160
27 169
28 174
29 188
30 193
31 202
32 207
33 212
34 231
35 236
36 241
37 246
38 251
39 256
40 306
41 311
42 316
43 321
44 326
45 331
46 336
47 357
48 362
49 367
50 383
51 388
52 393
53 409
54 414
55 425
56 430
57 446
58 462
59 478
60 489
61 494
62 505
63 516
64 521
65 532
66 543
67 554
68 565

List of values

[0, 1, 3, 6, 8, 11, 14, 17, 20, 27, 34, 41, 45, 49, 81, 85, 89, 102, 106, 115, 124, 128, 137, 142, 146, 151, 160, 169, 174, 188, 193, 202, 207, 212, 231, 236, 241, 246, 251, 256, 306, 311, 316, 321, 326, 331, 336, 357, 362, 367, 383, 388, 393, 409, 414, 425, 430, 446, 462, 478, 489, 494, 505, 516, 521, 532, 543, 554, 565]