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.

A376021 a(n) = Sum_{d|n} d^(n/d - d) * binomial(n/d-1,d-1).

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 1
6 5
7 1
8 13
9 2
10 33
11 1
12 90
13 1
14 193
15 55
16 450
17 1
18 1295
19 1
20 2321
21 1216
22 5121
23 1
24 16528
25 2
26 24577
27 20413
28 54529
29 1
30 193446
31 1
32 254721
33 295246
34 524289
35 376
36 2254023
37 1
38 2359297
39 3897235
40 5329176
41 1
42 24303263
43 1
44 23986177
45 48404882
46 46137345
47 1
48 274687104
49 2

List of values

[1, 1, 1, 2, 1, 5, 1, 13, 2, 33, 1, 90, 1, 193, 55, 450, 1, 1295, 1, 2321, 1216, 5121, 1, 16528, 2, 24577, 20413, 54529, 1, 193446, 1, 254721, 295246, 524289, 376, 2254023, 1, 2359297, 3897235, 5329176, 1, 24303263, 1, 23986177, 48404882, 46137345, 1, 274687104, 2]