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.

A166317 Exponential Riordan array [sec(2x), arctanh(tan(x))].

Table of values

n a(n)
0 1
1 0
2 1
3 4
4 0
5 1
6 0
7 16
8 0
9 1
10 80
11 0
12 40
13 0
14 1
15 0
16 640
17 0
18 80
19 0
20 1
21 3904
22 0
23 2800
24 0
25 140
26 0
27 1
28 0
29 49152
30 0
31 8960
32 0
33 224
34 0
35 1
36 354560
37 0
38 319744
39 0
40 23520
41 0
42 336
43 0
44 1
45 0
46 6225920
47 0
48 1454080
49 0
50 53760
51 0
52 480
53 0
54 1
55 51733504
56 0
57 54897920
58 0
59 5230720
60 0
61 110880
62 0
63 660
64 0
65 1

List of values

[1, 0, 1, 4, 0, 1, 0, 16, 0, 1, 80, 0, 40, 0, 1, 0, 640, 0, 80, 0, 1, 3904, 0, 2800, 0, 140, 0, 1, 0, 49152, 0, 8960, 0, 224, 0, 1, 354560, 0, 319744, 0, 23520, 0, 336, 0, 1, 0, 6225920, 0, 1454080, 0, 53760, 0, 480, 0, 1, 51733504, 0, 54897920, 0, 5230720, 0, 110880, 0, 660, 0, 1]