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.

A216915 T(n, k) = Product{1<=j<=n, gcd(j,k)=1 | j} / lcm{1<=j<=n, gcd(j,k)=1 | j} for n >= 0, k >= 1, square array read by antidiagonals.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 1
6 1
7 1
8 1
9 1
10 1
11 2
12 1
13 1
14 1
15 1
16 2
17 1
18 1
19 1
20 1
21 1
22 12
23 1
24 2
25 1
26 1
27 1
28 1
29 12
30 1
31 2
32 1
33 1
34 1
35 1
36 1
37 48
38 1
39 2
40 1
41 2
42 1
43 1
44 1
45 1
46 144
47 1
48 2
49 1
50 2
51 1
52 1
53 1
54 1
55 1
56 1440
57 3
58 8
59 1
60 12
61 1
62 2
63 1
64 1
65 1
66 1
67 1440
68 3
69 8
70 1
71 12
72 1
73 2
74 1
75 1
76 1
77 1
78 1
79 17280
80 3
81 80

List of values

[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 12, 1, 2, 1, 1, 1, 1, 12, 1, 2, 1, 1, 1, 1, 1, 48, 1, 2, 1, 2, 1, 1, 1, 1, 144, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1440, 3, 8, 1, 12, 1, 2, 1, 1, 1, 1, 1440, 3, 8, 1, 12, 1, 2, 1, 1, 1, 1, 1, 17280, 3, 80]