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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.

A147309 Riordan array [sec(x), log(sec(x) + tan(x))].

Table of values

n a(n)
0 1
1 0
2 1
3 1
4 0
5 1
6 0
7 4
8 0
9 1
10 5
11 0
12 10
13 0
14 1
15 0
16 40
17 0
18 20
19 0
20 1
21 61
22 0
23 175
24 0
25 35
26 0
27 1
28 0
29 768
30 0
31 560
32 0
33 56
34 0
35 1
36 1385
37 0
38 4996
39 0
40 1470
41 0
42 84
43 0
44 1
45 0
46 24320
47 0
48 22720
49 0
50 3360
51 0
52 120
53 0
54 1

List of values

[1, 0, 1, 1, 0, 1, 0, 4, 0, 1, 5, 0, 10, 0, 1, 0, 40, 0, 20, 0, 1, 61, 0, 175, 0, 35, 0, 1, 0, 768, 0, 560, 0, 56, 0, 1, 1385, 0, 4996, 0, 1470, 0, 84, 0, 1, 0, 24320, 0, 22720, 0, 3360, 0, 120, 0, 1]

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

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