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.

A067278 a(n) = letters(n) + a(n-1); a(0) = 0.

Table of values

n a(n)
0 0
1 3
2 6
3 11
4 15
5 19
6 22
7 27
8 32
9 36
10 39
11 45
12 51
13 59
14 67
15 74
16 81
17 90
18 98
19 106
20 112
21 121
22 130
23 141
24 151
25 161
26 170
27 181
28 192
29 202
30 208
31 217
32 226
33 237
34 247
35 257
36 266
37 277
38 288
39 298
40 303
41 311
42 319
43 329
44 338
45 347
46 355
47 365
48 375
49 384
50 389
51 397
52 405
53 415
54 424
55 433
56 441

List of values

[0, 3, 6, 11, 15, 19, 22, 27, 32, 36, 39, 45, 51, 59, 67, 74, 81, 90, 98, 106, 112, 121, 130, 141, 151, 161, 170, 181, 192, 202, 208, 217, 226, 237, 247, 257, 266, 277, 288, 298, 303, 311, 319, 329, 338, 347, 355, 365, 375, 384, 389, 397, 405, 415, 424, 433, 441]