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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.

A237621 Riordan array (1+x, x*(1-x)); inverse of Riordan array A237619.

Table of values

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

List of values

[1, 1, 1, 0, 0, 1, 0, -1, -1, 1, 0, 0, -1, -2, 1, 0, 0, 1, 0, -3, 1, 0, 0, 0, 2, 2, -4, 1, 0, 0, 0, -1, 2, 5, -5, 1, 0, 0, 0, 0, -3, 0, 9, -6, 1, 0, 0, 0, 0, 1, -5, -5, 14, -7, 1, 0, 0, 0, 0, 0, 4, -5, -14, 20, -8, 1, 0, 0, 0, 0, 0, -1, 9, 0, -28, 27, -9, 1]

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