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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.

A046215 First numerator and then denominator of 1/2-Pascal triangle (by row), excluding 1's.

Table of values

n a(n)
1 2
2 3
3 2
4 3
5 2
6 5
7 2
8 3
9 5
10 2
11 7
12 2
13 11
14 2
15 11
16 2
17 7
18 2
19 9
20 2
21 9
22 11
23 9
24 9
25 2
26 11
27 2
28 27
29 2
30 20
31 20
32 27
33 2
34 11
35 2
36 13
37 2
38 19
39 67
40 2
41 40
42 67
43 2
44 19
45 13
46 2
47 15
48 2
49 51
50 2
51 105
52 2
53 147
54 2
55 147
56 2
57 105
58 2
59 51
60 2
61 15
62 2
63 17
64 2
65 33
66 78
67 126
68 147
69 126
70 78
71 33
72 17
73 2
74 19
75 2
76 83
77 2
78 111
79 204

List of values

[2, 3, 2, 3, 2, 5, 2, 3, 5, 2, 7, 2, 11, 2, 11, 2, 7, 2, 9, 2, 9, 11, 9, 9, 2, 11, 2, 27, 2, 20, 20, 27, 2, 11, 2, 13, 2, 19, 67, 2, 40, 67, 2, 19, 13, 2, 15, 2, 51, 2, 105, 2, 147, 2, 147, 2, 105, 2, 51, 2, 15, 2, 17, 2, 33, 78, 126, 147, 126, 78, 33, 17, 2, 19, 2, 83, 2, 111, 204]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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