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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.

A127800 Inverse of number triangle A(n,k) = 1/(2 - 0^n), if k <= n <= 2k, 0 otherwise.

Table of values

n a(n)
0 1
1 0
2 2
3 0
4 -2
5 2
6 0
7 2
8 -2
9 2
10 0
11 0
12 0
13 -2
14 2
15 0
16 -2
17 2
18 0
19 -2
20 2
21 0
22 0
23 0
24 0
25 0
26 -2
27 2
28 0
29 2
30 -2
31 2
32 0
33 0
34 -2
35 2
36 0
37 0
38 0
39 0
40 0
41 0
42 0
43 -2
44 2
45 0
46 0
47 0
48 -2
49 2
50 0
51 0
52 0
53 -2
54 2
55 0
56 0
57 0
58 0
59 0
60 0
61 0
62 0
63 0
64 -2
65 2
66 0
67 -2
68 2
69 0
70 -2
71 2
72 0
73 0
74 0
75 0
76 -2
77 2

List of values

[1, 0, 2, 0, -2, 2, 0, 2, -2, 2, 0, 0, 0, -2, 2, 0, -2, 2, 0, -2, 2, 0, 0, 0, 0, 0, -2, 2, 0, 2, -2, 2, 0, 0, -2, 2, 0, 0, 0, 0, 0, 0, 0, -2, 2, 0, 0, 0, -2, 2, 0, 0, 0, -2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, -2, 2, 0, -2, 2, 0, -2, 2, 0, 0, 0, 0, -2, 2]

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