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.

A129895 a(1)=1. a(n) = a(n-1) + number of triangular numbers among the first (n-1) terms of the sequence.

Table of values

n a(n)
1 1
2 2
3 3
4 5
5 7
6 9
7 11
8 13
9 15
10 18
11 21
12 25
13 29
14 33
15 37
16 41
17 45
18 50
19 55
20 61
21 67
22 73
23 79
24 85
25 91
26 98
27 105
28 113
29 121
30 129
31 137
32 145
33 153
34 162
35 171
36 181
37 191
38 201
39 211
40 221
41 231
42 242
43 253
44 265
45 277
46 289
47 301
48 313
49 325
50 338
51 351
52 365
53 379
54 393
55 407
56 421
57 435
58 450
59 465
60 481

List of values

[1, 2, 3, 5, 7, 9, 11, 13, 15, 18, 21, 25, 29, 33, 37, 41, 45, 50, 55, 61, 67, 73, 79, 85, 91, 98, 105, 113, 121, 129, 137, 145, 153, 162, 171, 181, 191, 201, 211, 221, 231, 242, 253, 265, 277, 289, 301, 313, 325, 338, 351, 365, 379, 393, 407, 421, 435, 450, 465, 481]

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

Content is available under The OEIS End-User License Agreement.