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.

A011861 a(n) = floor(n(n-1)/8).

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 1
5 2
6 3
7 5
8 7
9 9
10 11
11 13
12 16
13 19
14 22
15 26
16 30
17 34
18 38
19 42
20 47
21 52
22 57
23 63
24 69
25 75
26 81
27 87
28 94
29 101
30 108
31 116
32 124
33 132
34 140
35 148
36 157
37 166
38 175
39 185
40 195
41 205
42 215
43 225
44 236
45 247
46 258
47 270
48 282
49 294
50 306
51 318
52 331
53 344
54 357
55 371
56 385
57 399
58 413
59 427
60 442
61 457
62 472

List of values

[0, 0, 0, 0, 1, 2, 3, 5, 7, 9, 11, 13, 16, 19, 22, 26, 30, 34, 38, 42, 47, 52, 57, 63, 69, 75, 81, 87, 94, 101, 108, 116, 124, 132, 140, 148, 157, 166, 175, 185, 195, 205, 215, 225, 236, 247, 258, 270, 282, 294, 306, 318, 331, 344, 357, 371, 385, 399, 413, 427, 442, 457, 472]