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.

A177121 Square array T(n,k) read by antidiagonals up: T(n,k) = 1 if n=1; otherwise if n divides k then T(n,k) = -n+1; otherwise T(n,k) = 1.

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 1
12 1
13 -2
14 -1
15 1
16 1
17 1
18 1
19 1
20 1
21 1
22 1
23 1
24 1
25 -3
26 1
27 -1
28 1
29 1
30 1
31 1
32 1
33 1
34 -2
35 1
36 1
37 1
38 1
39 1
40 1
41 -4
42 1
43 1
44 -1
45 1
46 1
47 1
48 1
49 1
50 1
51 1
52 1
53 1
54 1
55 1
56 1
57 1
58 1
59 1
60 1
61 -5
62 1
63 -3
64 -2
65 -1
66 1
67 1
68 1
69 1
70 1
71 1
72 1
73 1
74 1
75 1
76 1
77 1
78 1
79 1
80 1
81 1
82 1
83 1
84 1
85 -6
86 1
87 1
88 1
89 1
90 -1
91 1
92 1
93 1
94 1
95 1
96 1
97 1
98 1
99 1

List of values

[1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -2, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -3, 1, -1, 1, 1, 1, 1, 1, 1, -2, 1, 1, 1, 1, 1, 1, -4, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -5, 1, -3, -2, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -6, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1]