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.

A374981 a(n) = (n^2 - 1)/6 - Sum_{t=0..n-1} [ A000217(t)/n ], where [ x ] means the fractional part of x here.

Table of values

n a(n)
1 0
2 0
3 1
4 1
5 3
6 4
7 6
8 7
9 11
10 13
11 16
12 19
13 24
14 27
15 33
16 35
17 42
18 47
19 53
20 58
21 67
22 71
23 78
24 85
25 95
26 102
27 112
28 118
29 128
30 138
31 147
32 155
33 170
34 178
35 191
36 200
37 213
38 224
39 238
40 248
41 263
42 277
43 290
44 302
45 322
46 331
47 347
48 361
49 380
50 395
51 413
52 427
53 445
54 463
55 482
56 496
57 519
58 534
59 554
60 573
61 594
62 612
63 637
64 651
65 678
66 698

List of values

[0, 0, 1, 1, 3, 4, 6, 7, 11, 13, 16, 19, 24, 27, 33, 35, 42, 47, 53, 58, 67, 71, 78, 85, 95, 102, 112, 118, 128, 138, 147, 155, 170, 178, 191, 200, 213, 224, 238, 248, 263, 277, 290, 302, 322, 331, 347, 361, 380, 395, 413, 427, 445, 463, 482, 496, 519, 534, 554, 573, 594, 612, 637, 651, 678, 698]