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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.

A217948 List of numbers 2n for which the riffle permutation permutes all except the first and last of the 2n cards.

Table of values

n a(n)
1 4
2 6
3 12
4 14
5 20
6 30
7 38
8 54
9 60
10 62
11 68
12 84
13 102
14 108
15 132
16 140
17 150
18 164
19 174
20 180
21 182
22 198
23 212
24 228
25 270
26 294
27 318
28 348
29 350
30 374
31 380
32 390
33 420
34 422
35 444
36 462
37 468
38 492
39 510
40 524
41 542
42 548
43 558
44 564
45 588
46 614
47 620
48 654
49 660
50 662
51 678
52 702
53 710
54 758
55 774
56 788
57 798

List of values

[4, 6, 12, 14, 20, 30, 38, 54, 60, 62, 68, 84, 102, 108, 132, 140, 150, 164, 174, 180, 182, 198, 212, 228, 270, 294, 318, 348, 350, 374, 380, 390, 420, 422, 444, 462, 468, 492, 510, 524, 542, 548, 558, 564, 588, 614, 620, 654, 660, 662, 678, 702, 710, 758, 774, 788, 798]

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

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