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.

A368981 a(n) = Sum_{k=0..n} binomial(n, k - 1)*(1 - k)^(k - 1)*(n - k)*(n - k + 1)^(n - k).

Table of values

n a(n)
0 0
1 0
2 2
3 12
4 168
5 1720
6 33360
7 492324
8 12510848
9 242010864
10 7645282560
11 183157788220
12 6930019734528
13 198083231524776
14 8738660263983104
15 290276762478721620
16 14634486747811184640
17 554012204526293864416
18 31427811840457845964800
19 1335650409538235449288812
20 84210181959664202315202560

List of values

[0, 0, 2, 12, 168, 1720, 33360, 492324, 12510848, 242010864, 7645282560, 183157788220, 6930019734528, 198083231524776, 8738660263983104, 290276762478721620, 14634486747811184640, 554012204526293864416, 31427811840457845964800, 1335650409538235449288812, 84210181959664202315202560]