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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.

A120159 a(n) = 15 + floor((2 + Sum_{j=1..n-1} a(j))/3).

Table of values

n a(n)
1 15
2 20
3 27
4 36
5 48
6 64
7 85
8 114
9 152
10 202
11 270
12 360
13 480
14 640
15 853
16 1137
17 1516
18 2022
19 2696
20 3594
21 4792
22 6390
23 8520
24 11360
25 15146
26 20195
27 26927
28 35902
29 47870
30 63826
31 85102
32 113469
33 151292
34 201723
35 268964
36 358618
37 478158
38 637544
39 850058
40 1133411

List of values

[15, 20, 27, 36, 48, 64, 85, 114, 152, 202, 270, 360, 480, 640, 853, 1137, 1516, 2022, 2696, 3594, 4792, 6390, 8520, 11360, 15146, 20195, 26927, 35902, 47870, 63826, 85102, 113469, 151292, 201723, 268964, 358618, 478158, 637544, 850058, 1133411]

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

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