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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.

A109265 Row sums of Riordan array (1-x-x^2,x(1-x)).

Table of values

n a(n)
0 1
1 0
2 -2
3 -2
4 0
5 2
6 2
7 0
8 -2
9 -2
10 0
11 2
12 2
13 0
14 -2
15 -2
16 0
17 2
18 2
19 0
20 -2
21 -2
22 0
23 2
24 2
25 0
26 -2
27 -2
28 0
29 2
30 2
31 0
32 -2
33 -2
34 0
35 2
36 2
37 0
38 -2
39 -2
40 0
41 2
42 2
43 0
44 -2
45 -2
46 0
47 2
48 2
49 0
50 -2
51 -2
52 0
53 2
54 2
55 0
56 -2
57 -2
58 0
59 2
60 2
61 0
62 -2
63 -2
64 0
65 2
66 2
67 0
68 -2
69 -2
70 0
71 2
72 2
73 0
74 -2
75 -2
76 0
77 2
78 2
79 0
80 -2
81 -2
82 0

List of values

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

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