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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.

A137766 Elements to the right of the central element in writing first the numerator and then the denominator (left to right) of Leibniz's harmonic-like triangle.

Table of values

n a(n)
1 1
2 2
3 1
4 3
5 7
6 12
7 1
8 4
9 9
10 20
11 1
12 5
13 49
14 60
15 11
16 30
17 1
18 6
19 71
20 105
21 13
22 42
23 1
24 7
25 351
26 280
27 97
28 168
29 15
30 56
31 1
32 8
33 545
34 504
35 127
36 252
37 17
38 72
39 1
40 9
41 2561
42 1260
43 799
44 840
45 161
46 360
47 19
48 90
49 1
50 10
51 4159
52 2310
53 1121
54 1320
55 199
56 495
57 21
58 110
59 1
60 11

List of values

[1, 2, 1, 3, 7, 12, 1, 4, 9, 20, 1, 5, 49, 60, 11, 30, 1, 6, 71, 105, 13, 42, 1, 7, 351, 280, 97, 168, 15, 56, 1, 8, 545, 504, 127, 252, 17, 72, 1, 9, 2561, 1260, 799, 840, 161, 360, 19, 90, 1, 10, 4159, 2310, 1121, 1320, 199, 495, 21, 110, 1, 11]