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.

A078307 a(n) = Sum_{d divides n} (-1)^(n/d+1)*d^3.

Table of values

n a(n)
1 1
2 7
3 28
4 55
5 126
6 196
7 344
8 439
9 757
10 882
11 1332
12 1540
13 2198
14 2408
15 3528
16 3511
17 4914
18 5299
19 6860
20 6930
21 9632
22 9324
23 12168
24 12292
25 15751
26 15386
27 20440
28 18920
29 24390
30 24696
31 29792
32 28087
33 37296
34 34398
35 43344
36 41635
37 50654
38 48020
39 61544
40 55314
41 68922
42 67424

List of values

[1, 7, 28, 55, 126, 196, 344, 439, 757, 882, 1332, 1540, 2198, 2408, 3528, 3511, 4914, 5299, 6860, 6930, 9632, 9324, 12168, 12292, 15751, 15386, 20440, 18920, 24390, 24696, 29792, 28087, 37296, 34398, 43344, 41635, 50654, 48020, 61544, 55314, 68922, 67424]