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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.

A089279 a(n) = 2 + sum(k=1 to n) [(-1)^k A001511(k)].

Table of values

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

List of values

[1, 3, 2, 5, 4, 6, 5, 9, 8, 10, 9, 12, 11, 13, 12, 17, 16, 18, 17, 20, 19, 21, 20, 24, 23, 25, 24, 27, 26, 28, 27, 33, 32, 34, 33, 36, 35, 37, 36, 40, 39, 41, 40, 43, 42, 44, 43, 48, 47, 49, 48, 51, 50, 52, 51, 55, 54, 56, 55, 58, 57, 59, 58, 65, 64, 66, 65, 68, 67, 69, 68, 72]

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

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