cp's OEIS Frontend

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.

A081840 a(1)=0, a(n)=a(n-1)+3 if n is already in the sequence, a(n)=a(n-1)+4 otherwise.

Table of values

n a(n)
1 0
2 4
3 8
4 11
5 15
6 19
7 23
8 26
9 30
10 34
11 37
12 41
13 45
14 49
15 52
16 56
17 60
18 64
19 67
20 71
21 75
22 79
23 82
24 86
25 90
26 93
27 97
28 101
29 105
30 108
31 112
32 116
33 120
34 123
35 127
36 131
37 134
38 138
39 142
40 146
41 149
42 153
43 157
44 161
45 164
46 168
47 172
48 176
49 179
50 183
51 187
52 190
53 194
54 198
55 202
56 205
57 209
58 213
59 217

List of values

[0, 4, 8, 11, 15, 19, 23, 26, 30, 34, 37, 41, 45, 49, 52, 56, 60, 64, 67, 71, 75, 79, 82, 86, 90, 93, 97, 101, 105, 108, 112, 116, 120, 123, 127, 131, 134, 138, 142, 146, 149, 153, 157, 161, 164, 168, 172, 176, 179, 183, 187, 190, 194, 198, 202, 205, 209, 213, 217]

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

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