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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.

A125171 Riordan array ((1-x)/(1-3*x+x^2),x/(1-x)) read by rows.

Table of values

n a(n)
0 1
1 2
2 1
3 5
4 3
5 1
6 13
7 8
8 4
9 1
10 34
11 21
12 12
13 5
14 1
15 89
16 55
17 33
18 17
19 6
20 1
21 233
22 144
23 88
24 50
25 23
26 7
27 1
28 610
29 377
30 232
31 138
32 73
33 30
34 8
35 1
36 1597
37 987
38 609
39 370
40 211
41 103
42 38
43 9
44 1
45 4181
46 2584
47 1596
48 979
49 581
50 314
51 141
52 47
53 10
54 1
55 10946
56 6765
57 4180
58 2575
59 1560
60 895
61 455
62 188
63 57
64 11
65 1
66 28657
67 17711
68 10945
69 6755
70 4135
71 2455
72 1350
73 643

List of values

[1, 2, 1, 5, 3, 1, 13, 8, 4, 1, 34, 21, 12, 5, 1, 89, 55, 33, 17, 6, 1, 233, 144, 88, 50, 23, 7, 1, 610, 377, 232, 138, 73, 30, 8, 1, 1597, 987, 609, 370, 211, 103, 38, 9, 1, 4181, 2584, 1596, 979, 581, 314, 141, 47, 10, 1, 10946, 6765, 4180, 2575, 1560, 895, 455, 188, 57, 11, 1, 28657, 17711, 10945, 6755, 4135, 2455, 1350, 643]